Provide local paths for file tests. (#2830)

The intent of this change is that instead of paths looking like `explorer/testdata/foo/bar.carbon` (repo-relative), they're now just `bar.carbon` (local). The consequence is that paths should be a bit more durable in various environments, and just paths should be shorter and easier to read.

The explorer's prelude is an exception to this since it comes from data, rather than being the test target. Due to the change in approaches, it needs the regex again.

Uses #2829

explorer/file_test.cpp

@@ -8,23 +8,24 @@
 namespace Carbon::Testing {
 namespace {
 
-static constexpr char PreludePath[] = "explorer/data/prelude.carbon";
-
 class ParseAndExecuteTestFile : public FileTestBase {
  public:
-  explicit ParseAndExecuteTestFile(llvm::StringRef path, bool trace)
+  explicit ParseAndExecuteTestFile(const std::filesystem::path& path,
+                                   bool trace)
       : FileTestBase(path), trace_(trace) {}
 
   auto SetUp() -> void override {
     if (trace_) {
-      if (path().find("/limits/") != llvm::StringRef::npos) {
+      std::string path_str = path().string();
+      llvm::StringRef path_ref = path_str;
+      if (path_ref.find("/limits/") != llvm::StringRef::npos) {
         GTEST_SKIP()
             << "`limits` tests check for various limit conditions (such as an "
                "infinite loop). The tests collectively don't test tracing "
                "because it creates substantial additional overhead.";
-      } else if (path().endswith(
+      } else if (path_ref.endswith(
                      "testdata/assoc_const/rewrite_large_type.carbon") ||
-                 path().endswith(
+                 path_ref.endswith(
                      "testdata/linked_list/typed_linked_list.carbon")) {
         GTEST_SKIP() << "Expensive test to trace";
       }
@@ -41,10 +42,16 @@ class ParseAndExecuteTestFile : public FileTestBase {
       trace_stream.set_stream(&trace_stream_ostream);
     }
 
+    // Set the location of the prelude.
+    char* test_srcdir = getenv("TEST_SRCDIR");
+    CARBON_CHECK(test_srcdir != nullptr);
+    std::string prelude_path(test_srcdir);
+    prelude_path += "/carbon/explorer/data/prelude.carbon";
+
     // Run the parse. Parser debug output is always off because it's difficult
     // to redirect.
     auto result =
-        ParseAndExecuteFile(PreludePath, path().str(),
+        ParseAndExecuteFile(prelude_path, path().filename().string(),
                             /*parser_debug=*/false, &trace_stream, &stdout);
     // This mirrors printing currently done by main.cpp.
     if (result.ok()) {
@@ -67,14 +74,15 @@ class ParseAndExecuteTestFile : public FileTestBase {
 
 }  // namespace
 
-extern auto RegisterFileTests(const std::vector<llvm::StringRef>& paths)
+extern auto RegisterFileTests(const std::vector<std::filesystem::path>& paths)
     -> void {
   ParseAndExecuteTestFile::RegisterTests(
-      "ParseAndExecuteTestFile", paths, [=](llvm::StringRef path) {
+      "ParseAndExecuteTestFile", paths, [=](const std::filesystem::path& path) {
         return new ParseAndExecuteTestFile(path, /*trace=*/false);
       });
   ParseAndExecuteTestFile::RegisterTests(
-      "ParseAndExecuteTestFile.trace", paths, [=](llvm::StringRef path) {
+      "ParseAndExecuteTestFile.trace", paths,
+      [=](const std::filesystem::path& path) {
         return new ParseAndExecuteTestFile(path, /*trace=*/true);
       });
 }

explorer/testdata/addr/fail_method_let.carbon

@@ -24,7 +24,7 @@ class Point {
 
 fn Main() -> i32 {
   let p: Point = Point.Origin();
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/addr/fail_method_let.carbon:[[@LINE+1]]: method p.GetSetX requires its receiver to be a reference expression
+  // CHECK:STDERR: COMPILATION ERROR: fail_method_let.carbon:[[@LINE+1]]: method p.GetSetX requires its receiver to be a reference expression
   var x: auto = p.GetSetX(42);
   if (p.x == 42) {
     return x;

explorer/testdata/addr/fail_method_self_misspelled.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 class C {
-  // CHECK:STDERR: SYNTAX ERROR: explorer/testdata/addr/fail_method_self_misspelled.carbon:[[@LINE+1]]: illegal binding pattern in implicit parameter list
+  // CHECK:STDERR: SYNTAX ERROR: fail_method_self_misspelled.carbon:[[@LINE+1]]: illegal binding pattern in implicit parameter list
   fn F[addr slef: Self*]() {}
 }
 

explorer/testdata/addr/fail_method_self_type.carbon

@@ -28,7 +28,7 @@ class Point {
 
 fn Main() -> i32 {
   var p: Point = Point.Origin();
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/addr/fail_method_self_type.carbon:[[@LINE+3]]: type error in method access, receiver type
+  // CHECK:STDERR: COMPILATION ERROR: fail_method_self_type.carbon:[[@LINE+3]]: type error in method access, receiver type
   // CHECK:STDERR: expected: class Shape
   // CHECK:STDERR: actual: class Point
   var x: auto = p.GetSetX(42);

explorer/testdata/alias/fail_alias_expression.carbon

@@ -6,7 +6,7 @@
 
 package ExplorerTest api;
 
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/alias/fail_alias_expression.carbon:[[@LINE+1]]: invalid target for alias declaration
+// CHECK:STDERR: COMPILATION ERROR: fail_alias_expression.carbon:[[@LINE+1]]: invalid target for alias declaration
 alias A = 5;
 
 fn Main() -> i32 { return 0; }

explorer/testdata/alias/fail_alias_var.carbon

@@ -8,7 +8,7 @@ package ExplorerTest api;
 
 var v: i32;
 // TODO: This should probably be valid if we allow global variables at all.
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/alias/fail_alias_var.carbon:[[@LINE+1]]: invalid target for alias declaration
+// CHECK:STDERR: COMPILATION ERROR: fail_alias_var.carbon:[[@LINE+1]]: invalid target for alias declaration
 alias A = v;
 
 fn Main() -> i32 { return 0; }

explorer/testdata/alias/fail_interface_method_as_class_member.carbon

@@ -33,7 +33,7 @@ impl forall [U:! Printable] Vector(U) as Printable {
 
 fn Main() -> i32 {
   var v: Vector(String) = {.x = "test"};
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/alias/fail_interface_method_as_class_member.carbon:[[@LINE+1]]: Member access to aliases is not yet supported.
+  // CHECK:STDERR: COMPILATION ERROR: fail_interface_method_as_class_member.carbon:[[@LINE+1]]: Member access to aliases is not yet supported.
   v.PrintIt();
   return 42;
 }

explorer/testdata/alias/fail_namespace_alias_member.carbon

@@ -10,7 +10,7 @@ namespace N;
 alias M = N;
 // TODO: It's unclear whether this should be permitted. If not, we should
 // produce a better diagnostic.
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/alias/fail_namespace_alias_member.carbon:[[@LINE+1]]: alias M cannot be used as a name qualifier
+// CHECK:STDERR: COMPILATION ERROR: fail_namespace_alias_member.carbon:[[@LINE+1]]: alias M cannot be used as a name qualifier
 fn M.F() {}
 
 fn Main() -> i32 {

explorer/testdata/alias/fail_self_alias.carbon

@@ -6,7 +6,7 @@
 
 package ExplorerTest api;
 
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/alias/fail_self_alias.carbon:[[@LINE+1]]: 'a' is not usable until after it has been completely declared
+// CHECK:STDERR: COMPILATION ERROR: fail_self_alias.carbon:[[@LINE+1]]: 'a' is not usable until after it has been completely declared
 alias a = a;
 
 fn Main() -> i32 {

explorer/testdata/alias/fail_wrong_fn_alias_use.carbon

@@ -9,7 +9,7 @@ package ExplorerTest api;
 fn F() {}
 alias A = F;
 
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/alias/fail_wrong_fn_alias_use.carbon:[[@LINE+1]]: alias A cannot be used as a name qualifier
+// CHECK:STDERR: COMPILATION ERROR: fail_wrong_fn_alias_use.carbon:[[@LINE+1]]: alias A cannot be used as a name qualifier
 fn A.Foo() {}
 
 fn Main() -> i32 {

explorer/testdata/alias/fail_wrong_fn_alias_use_expr.carbon

@@ -10,6 +10,6 @@ fn F() {}
 alias A = F;
 
 fn Main() -> i32 {
-    // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/alias/fail_wrong_fn_alias_use_expr.carbon:[[@LINE+1]]: member access, unexpected fn () -> () in A.x
+    // CHECK:STDERR: COMPILATION ERROR: fail_wrong_fn_alias_use_expr.carbon:[[@LINE+1]]: member access, unexpected fn () -> () in A.x
     return A.x;
 }

explorer/testdata/alias/fail_wrong_interface_alias_use.carbon

@@ -10,6 +10,6 @@ interface Foo {}
 alias A = Foo;
 
 fn Main() -> i32 {
-    // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/alias/fail_wrong_interface_alias_use.carbon:[[@LINE+1]]: member access, bar not in interface Foo
+    // CHECK:STDERR: COMPILATION ERROR: fail_wrong_interface_alias_use.carbon:[[@LINE+1]]: member access, bar not in interface Foo
     return A.bar;
 }

explorer/testdata/alias/fail_wrong_namepsace_alias_use.carbon

@@ -10,6 +10,6 @@ namespace Foo;
 alias A = Foo;
 
 fn Main() -> i32 {
-    // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/alias/fail_wrong_namepsace_alias_use.carbon:[[@LINE+1]]: expected `.member_name` after name of namespace Foo
+    // CHECK:STDERR: COMPILATION ERROR: fail_wrong_namepsace_alias_use.carbon:[[@LINE+1]]: expected `.member_name` after name of namespace Foo
     return A;
 }

explorer/testdata/array/fail_index.carbon

@@ -8,6 +8,6 @@ package ExplorerTest api;
 
 fn Main() -> i32 {
   var x: [i32; 2] = (0, 1);
-  // CHECK:STDERR: RUNTIME ERROR: explorer/testdata/array/fail_index.carbon:[[@LINE+1]]: index 2 out of range in (0, 1)
+  // CHECK:STDERR: RUNTIME ERROR: fail_index.carbon:[[@LINE+1]]: index 2 out of range in (0, 1)
   return x[2];
 }

explorer/testdata/array/fail_negative_size.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/array/fail_negative_size.carbon:[[@LINE+1]]: Array size cannot be negative
+  // CHECK:STDERR: COMPILATION ERROR: fail_negative_size.carbon:[[@LINE+1]]: Array size cannot be negative
   var x: [i32; -1] = ();
   return x[0];
 }

explorer/testdata/array/fail_print_uninitalized_array_element.carbon

@@ -8,7 +8,7 @@ package ExplorerTest impl;
 
 fn Main() -> i32 {
   var my_array : [i32; 1];
-  // CHECK:STDERR: RUNTIME ERROR: explorer/testdata/array/fail_print_uninitalized_array_element.carbon:[[@LINE+1]]: Printing uninitialized value
+  // CHECK:STDERR: RUNTIME ERROR: fail_print_uninitalized_array_element.carbon:[[@LINE+1]]: Printing uninitialized value
   Print("{0}", my_array[0]);
   return 0;
 }

explorer/testdata/array/fail_size_mismatch.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/array/fail_size_mismatch.carbon:[[@LINE+1]]: type error in initializer of variable: '(i32, i32, i32)' is not implicitly convertible to '[i32; 2]'
+  // CHECK:STDERR: COMPILATION ERROR: fail_size_mismatch.carbon:[[@LINE+1]]: type error in initializer of variable: '(i32, i32, i32)' is not implicitly convertible to '[i32; 2]'
   var x: [i32; 2] = (0, 1, 2);
   return x[0];
 }

explorer/testdata/as/fail_destination_not_type.carbon

@@ -7,6 +7,6 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/as/fail_destination_not_type.carbon:[[@LINE+1]]: type error in type expression: 'i32' is not implicitly convertible to 'type'
+  // CHECK:STDERR: COMPILATION ERROR: fail_destination_not_type.carbon:[[@LINE+1]]: type error in type expression: 'i32' is not implicitly convertible to 'type'
   return 4 as 7;
 }

explorer/testdata/as/fail_intrinsic_convert_no_args.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/as/fail_intrinsic_convert_no_args.carbon:[[@LINE+1]]: __intrinsic_implicit_as_convert takes 2 arguments
+  // CHECK:STDERR: COMPILATION ERROR: fail_intrinsic_convert_no_args.carbon:[[@LINE+1]]: __intrinsic_implicit_as_convert takes 2 arguments
   __intrinsic_implicit_as_convert();
   return 0;
 }

explorer/testdata/as/fail_intrinsic_convert_non_type.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/as/fail_intrinsic_convert_non_type.carbon:[[@LINE+1]]: type error in type expression: 'i32' is not implicitly convertible to 'type'
+  // CHECK:STDERR: COMPILATION ERROR: fail_intrinsic_convert_non_type.carbon:[[@LINE+1]]: type error in type expression: 'i32' is not implicitly convertible to 'type'
   __intrinsic_implicit_as_convert("example", 0);
   return 0;
 }

explorer/testdata/as/fail_intrinsic_no_args.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/as/fail_intrinsic_no_args.carbon:[[@LINE+1]]: __intrinsic_implicit_as takes 1 argument
+  // CHECK:STDERR: COMPILATION ERROR: fail_intrinsic_no_args.carbon:[[@LINE+1]]: __intrinsic_implicit_as takes 1 argument
   __intrinsic_implicit_as();
   return 0;
 }

explorer/testdata/as/fail_intrinsic_non_type.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/as/fail_intrinsic_non_type.carbon:[[@LINE+1]]: type error in type expression: 'i32' is not implicitly convertible to 'type'
+  // CHECK:STDERR: COMPILATION ERROR: fail_intrinsic_non_type.carbon:[[@LINE+1]]: type error in type expression: 'i32' is not implicitly convertible to 'type'
   __intrinsic_implicit_as(0);
   return 0;
 }

explorer/testdata/as/fail_no_conversion.carbon

@@ -10,7 +10,7 @@ class A { var n: i32; }
 
 fn Main() -> i32 {
   var a: A = {.n = 5};
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/as/fail_no_conversion.carbon:[[@LINE+2]]: type error in `as`: `class A` is not explicitly convertible to `i32`:
+  // CHECK:STDERR: COMPILATION ERROR: fail_no_conversion.carbon:[[@LINE+2]]: type error in `as`: `class A` is not explicitly convertible to `i32`:
   // CHECK:STDERR: could not find implementation of interface As(T = i32) for class A
   return a as i32;
 }

explorer/testdata/assert/fail_assert.carbon

@@ -3,7 +3,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 // AUTOUPDATE
-// CHECK:STDERR: RUNTIME ERROR: explorer/data/prelude.carbon:{{.*}}: "HALLO WELT"
+// CHECK:STDERR: RUNTIME ERROR: {{.*}}/explorer/data/prelude.carbon:{{.*}}: "HALLO WELT"
 
 package ExplorerTest api;
 

explorer/testdata/assert/fail_convert.carbon

@@ -3,7 +3,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 // AUTOUPDATE
-// CHECK:STDERR: RUNTIME ERROR: explorer/data/prelude.carbon:{{.*}}: "Fail"
+// CHECK:STDERR: RUNTIME ERROR: {{.*}}/explorer/data/prelude.carbon:{{.*}}: "Fail"
 
 package ExplorerTest api;
 

explorer/testdata/assert/fail_intrinsic_bool_type.carbon

@@ -14,7 +14,7 @@ class ConvertTo(T:! type) {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: SYNTAX ERROR: explorer/testdata/assert/fail_intrinsic_bool_type.carbon:[[@LINE+1]]: syntax error, unexpected COMMA
+  // CHECK:STDERR: SYNTAX ERROR: fail_intrinsic_bool_type.carbon:[[@LINE+1]]: syntax error, unexpected COMMA
   __intrinsic_assert(, "unused");
   return 0;
 }

explorer/testdata/assert/fail_intrinsic_no_args.carbon

@@ -14,7 +14,7 @@ class ConvertTo(T:! type) {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assert/fail_intrinsic_no_args.carbon:[[@LINE+1]]: __intrinsic_assert takes 2 arguments
+  // CHECK:STDERR: COMPILATION ERROR: fail_intrinsic_no_args.carbon:[[@LINE+1]]: __intrinsic_assert takes 2 arguments
   __intrinsic_assert();
   return 0;
 }

explorer/testdata/assert/fail_intrinsic_no_convert.carbon

@@ -14,7 +14,7 @@ class ConvertTo(T:! type) {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assert/fail_intrinsic_no_convert.carbon:[[@LINE+3]]: type error in __intrinsic_assert argument 0
+  // CHECK:STDERR: COMPILATION ERROR: fail_intrinsic_no_convert.carbon:[[@LINE+3]]: type error in __intrinsic_assert argument 0
   // CHECK:STDERR: expected: bool
   // CHECK:STDERR: actual: class ConvertTo(T = bool)
   __intrinsic_assert({.v = true} as ConvertTo(bool), {.v = "Pass"} as ConvertTo(String));

explorer/testdata/assert/fail_intrinsic_str_type.carbon

@@ -14,7 +14,7 @@ class ConvertTo(T:! type) {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assert/fail_intrinsic_str_type.carbon:[[@LINE+3]]: type error in __intrinsic_assert argument 1
+  // CHECK:STDERR: COMPILATION ERROR: fail_intrinsic_str_type.carbon:[[@LINE+3]]: type error in __intrinsic_assert argument 1
   // CHECK:STDERR: expected: String
   // CHECK:STDERR: actual: i32
   __intrinsic_assert(true, 1);

explorer/testdata/assoc_const/fail_anonymous.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 interface Iface {
-  // CHECK:STDERR: SYNTAX ERROR: explorer/testdata/assoc_const/fail_anonymous.carbon:[[@LINE+1]]: syntax error, unexpected UNDERSCORE, expecting identifier or TEMPLATE
+  // CHECK:STDERR: SYNTAX ERROR: fail_anonymous.carbon:[[@LINE+1]]: syntax error, unexpected UNDERSCORE, expecting identifier or TEMPLATE
   let _:! type;
 }
 

explorer/testdata/assoc_const/fail_different_type.carbon

@@ -19,7 +19,7 @@ external impl Bad as Iface where .T = Bad {}
 
 fn Main() -> i32 {
   F(Good);
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_different_type.carbon:[[@LINE+1]]: constraint requires that (T).(Iface.T) (with value class Bad) == i32, which is not known to be true
+  // CHECK:STDERR: COMPILATION ERROR: fail_different_type.carbon:[[@LINE+1]]: constraint requires that (T).(Iface.T) (with value class Bad) == i32, which is not known to be true
   F(Bad);
   return 0;
 }

explorer/testdata/assoc_const/fail_different_value.carbon

@@ -19,7 +19,7 @@ external impl Bad as Iface where .N = 4 {}
 
 fn Main() -> i32 {
   F(Good);
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_different_value.carbon:[[@LINE+1]]: constraint requires that (T).(Iface.N) (with value 4) == 5, which is not known to be true
+  // CHECK:STDERR: COMPILATION ERROR: fail_different_value.carbon:[[@LINE+1]]: constraint requires that (T).(Iface.N) (with value 4) == 5, which is not known to be true
   F(Bad);
   return 0;
 }

explorer/testdata/assoc_const/fail_equal_indirectly.carbon

@@ -24,7 +24,7 @@ fn G[U:! type where .Self == i32, T:! Iface where .T = U](x: T, y: U) {
 
 // Not OK: would require looking through two levels of `==`.
 fn H[V:! type where .Self == i32, W:! Iface where .T == V](x: W, y: V) {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_equal_indirectly.carbon:[[@LINE+1]]: constraint requires that (T).(Iface.T) (with value (W).(Iface.T)) == i32, which is not known to be true
+  // CHECK:STDERR: COMPILATION ERROR: fail_equal_indirectly.carbon:[[@LINE+1]]: constraint requires that (T).(Iface.T) (with value (W).(Iface.T)) == i32, which is not known to be true
   F(x);
 }
 

explorer/testdata/assoc_const/fail_equal_to_dependent_type.carbon

@@ -17,7 +17,7 @@ fn G[U:! Iface where .T == i32](x: U) {
 }
 
 fn H[V:! Iface](x: V) {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_equal_to_dependent_type.carbon:[[@LINE+1]]: constraint requires that (T).(Iface.T) (with value (V).(Iface.T)) == i32, which is not known to be true
+  // CHECK:STDERR: COMPILATION ERROR: fail_equal_to_dependent_type.carbon:[[@LINE+1]]: constraint requires that (T).(Iface.T) (with value (V).(Iface.T)) == i32, which is not known to be true
   F(x);
 }
 

explorer/testdata/assoc_const/fail_implied_constraints.carbon

@@ -16,7 +16,7 @@ interface Z {
   // We reject this even though it is the responsibility of the `impl as Z` to
   // provide a type `N` such that `i32 is X(N)`. We might want to treat this as
   // an implied constraint and allow this in the future.
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_implied_constraints.carbon:[[@LINE+1]]: could not find implementation of interface X(T = N) for i32
+  // CHECK:STDERR: COMPILATION ERROR: fail_implied_constraints.carbon:[[@LINE+1]]: could not find implementation of interface X(T = N) for i32
   let N:! Y(.Self) where .M = i32;
 }
 

explorer/testdata/assoc_const/fail_incomplete_impl_1.carbon

@@ -12,7 +12,7 @@ interface HasThreeTypes {
   let C:! type;
 }
 
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_incomplete_impl_1.carbon:[[@LINE+1]]: implementation doesn't provide a concrete value for interface HasThreeTypes.B
+// CHECK:STDERR: COMPILATION ERROR: fail_incomplete_impl_1.carbon:[[@LINE+1]]: implementation doesn't provide a concrete value for interface HasThreeTypes.B
 external impl i32 as HasThreeTypes where .A = i32 and .C = i32 {}
 
 fn Main() -> i32 { return 0; }

explorer/testdata/assoc_const/fail_incomplete_impl_2.carbon

@@ -12,7 +12,7 @@ interface HasThreeTypes {
   let C:! type;
 }
 
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_incomplete_impl_2.carbon:[[@LINE+1]]: implementation doesn't provide a concrete value for interface HasThreeTypes.C
+// CHECK:STDERR: COMPILATION ERROR: fail_incomplete_impl_2.carbon:[[@LINE+1]]: implementation doesn't provide a concrete value for interface HasThreeTypes.C
 external impl i32 as HasThreeTypes where .A = i32 and .B = .C {}
 
 fn Main() -> i32 { return 0; }

explorer/testdata/assoc_const/fail_indirectly_equal.carbon

@@ -21,7 +21,7 @@ fn F2[U:! A where .T == i32](x: i32) -> U.T {
 }
 
 fn F3[T:! A where .T == i32, U:! A where .T == i32](x: T.T) -> U.T {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_indirectly_equal.carbon:[[@LINE+1]]: type error in return value: '(T).(A.T)' is not implicitly convertible to '(U).(A.T)'
+  // CHECK:STDERR: COMPILATION ERROR: fail_indirectly_equal.carbon:[[@LINE+1]]: type error in return value: '(T).(A.T)' is not implicitly convertible to '(U).(A.T)'
   return x;
 }
 

explorer/testdata/assoc_const/fail_match_in_deduction.carbon

@@ -20,7 +20,7 @@ fn F[Scalar:! type, V:! Vector where .Dim == 3](p: Point(Scalar, V.Dim), v: V) {
 fn G[Scalar:! type](p: Point(Scalar, 3)) {}
 fn H[V:! Vector where .Dim == 3](v: V) {
   var p: Point(i32, V.Dim) = {};
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_match_in_deduction.carbon:[[@LINE+1]]: mismatch in non-deduced values, `(V).(Vector.Dim)` != `3`
+  // CHECK:STDERR: COMPILATION ERROR: fail_match_in_deduction.carbon:[[@LINE+1]]: mismatch in non-deduced values, `(V).(Vector.Dim)` != `3`
   G(p);
 }
 

explorer/testdata/assoc_const/fail_missing_equal.carbon

@@ -16,7 +16,7 @@ fn A[T:! Container where .Element == i32](x: T) -> T.Element {
 }
 
 fn B[T:! Container](x: T) -> T.Element {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_missing_equal.carbon:[[@LINE+1]]: constraint requires that (T).(Container.Element) (with value (T).(Container.Element)) == i32, which is not known to be true
+  // CHECK:STDERR: COMPILATION ERROR: fail_missing_equal.carbon:[[@LINE+1]]: constraint requires that (T).(Container.Element) (with value (T).(Container.Element)) == i32, which is not known to be true
   return A(x);
 }
 

explorer/testdata/assoc_const/fail_missing_rewrite.carbon

@@ -16,7 +16,7 @@ fn A[T:! Container where .Element = i32](x: T) -> T.Element {
 }
 
 fn B[T:! Container](x: T) -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_missing_rewrite.carbon:[[@LINE+1]]: constraint requires that (T).(Container.Element) (with value (T).(Container.Element)) == i32, which is not known to be true
+  // CHECK:STDERR: COMPILATION ERROR: fail_missing_rewrite.carbon:[[@LINE+1]]: constraint requires that (T).(Container.Element) (with value (T).(Container.Element)) == i32, which is not known to be true
   return A(x);
 }
 

explorer/testdata/assoc_const/fail_multiple_deduction.carbon

@@ -14,7 +14,7 @@ interface HasThreeTypes {
 }
 fn F[T:! type](x: (T, T, T));
 fn G[X:! HasThreeTypes where .A == .B and .B == .C and .C == .A](x: X) {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_multiple_deduction.carbon:[[@LINE+3]]: deduced multiple different values for T:! type:
+  // CHECK:STDERR: COMPILATION ERROR: fail_multiple_deduction.carbon:[[@LINE+3]]: deduced multiple different values for T:! type:
   // CHECK:STDERR:   (X).(HasThreeTypes.A)
   // CHECK:STDERR:   (X).(HasThreeTypes.B)
   F(x.Make());

explorer/testdata/assoc_const/fail_overspecified_impl.carbon

@@ -10,7 +10,7 @@ interface HasType {
   let T:! type;
 }
 
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_overspecified_impl.carbon:[[@LINE+3]]: multiple different rewrites for `(i32).(HasType.T)`:
+// CHECK:STDERR: COMPILATION ERROR: fail_overspecified_impl.carbon:[[@LINE+3]]: multiple different rewrites for `(i32).(HasType.T)`:
 // CHECK:STDERR:   i32
 // CHECK:STDERR:   {.a: i32}
 external impl i32 as HasType where .T = i32 and .T = {.a: i32} {}

explorer/testdata/assoc_const/fail_redefined.carbon

@@ -8,7 +8,7 @@ package ExplorerTest api;
 
 interface Iface {
   let T:! type;
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_redefined.carbon:[[@LINE+1]]: Duplicate name `T` also found at explorer/testdata/assoc_const/fail_redefined.carbon:[[@LINE-1]]
+  // CHECK:STDERR: COMPILATION ERROR: fail_redefined.carbon:[[@LINE+1]]: Duplicate name `T` also found at fail_redefined.carbon:[[@LINE-1]]
   let T:! type;
 }
 

explorer/testdata/assoc_const/fail_rewrite_creates_infinite_type.carbon

@@ -10,7 +10,7 @@ interface HasType {
   let T:! type;
 }
 
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_rewrite_creates_infinite_type.carbon:[[@LINE+1]]: rewrite of (H).(HasType.T) applies within its own resolved expansion of (H).(HasType.T)*
+// CHECK:STDERR: COMPILATION ERROR: fail_rewrite_creates_infinite_type.carbon:[[@LINE+1]]: rewrite of (H).(HasType.T) applies within its own resolved expansion of (H).(HasType.T)*
 fn F[H:! HasType where .T = .T*]() {}
 
 fn Main() -> i32 {

explorer/testdata/assoc_const/fail_rewrite_cycle.carbon

@@ -30,7 +30,7 @@ fn F[
     .T6 = .T7 and
     .T7 = .T8 and
     .T8 = .T9 and
-    // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_rewrite_cycle.carbon:[[@LINE+1]]: rewrite of (M).(ManyTypes.T4) applies within its own resolved expansion of (M).(ManyTypes.T4)
+    // CHECK:STDERR: COMPILATION ERROR: fail_rewrite_cycle.carbon:[[@LINE+1]]: rewrite of (M).(ManyTypes.T4) applies within its own resolved expansion of (M).(ManyTypes.T4)
     .T9 = .T0]() {}
 
 fn Main() -> i32 {

explorer/testdata/assoc_const/fail_rewrite_depends_on_later_rewrite.carbon

@@ -11,7 +11,7 @@ interface HasTypeAndValue {
   let V:! T;
 }
 
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_rewrite_depends_on_later_rewrite.carbon:[[@LINE+1]]: type error in rewrite constraint: 'i32' is not implicitly convertible to '(X).(HasTypeAndValue.T)'
+// CHECK:STDERR: COMPILATION ERROR: fail_rewrite_depends_on_later_rewrite.carbon:[[@LINE+1]]: type error in rewrite constraint: 'i32' is not implicitly convertible to '(X).(HasTypeAndValue.T)'
 fn F(X:! HasTypeAndValue where .V = 5 and .T = i32) -> i32 { return X.V; }
 
 impl i32 as HasTypeAndValue where .T = i32 and .V = 5 {}

explorer/testdata/assoc_const/fail_simple_rewrite_cycle_1.carbon

@@ -13,7 +13,7 @@ interface TwoTypes {
 
 // Attempting to fully resolve the replacement for `.T` would never create a
 // situation where `.T`'s expansion involves `.T`. Ensure we catch this anyway.
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_simple_rewrite_cycle_1.carbon:[[@LINE+1]]: rewrite of (X).(TwoTypes.U) applies within its own resolved expansion of (X).(TwoTypes.U)*
+// CHECK:STDERR: COMPILATION ERROR: fail_simple_rewrite_cycle_1.carbon:[[@LINE+1]]: rewrite of (X).(TwoTypes.U) applies within its own resolved expansion of (X).(TwoTypes.U)*
 fn F[X:! TwoTypes where .T = .U and .U = .U*]() {}
 
 fn Main() -> i32 {

explorer/testdata/assoc_const/fail_simple_rewrite_cycle_2.carbon

@@ -13,7 +13,7 @@ interface TwoTypes {
 
 // Attempting to fully resolve the replacement for `.T` would never create a
 // situation where `.T`'s expansion involves `.T`. Ensure we catch this anyway.
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_simple_rewrite_cycle_2.carbon:[[@LINE+1]]: rewrite of (X).(TwoTypes.U) applies within its own resolved expansion of (X).(TwoTypes.U)*
+// CHECK:STDERR: COMPILATION ERROR: fail_simple_rewrite_cycle_2.carbon:[[@LINE+1]]: rewrite of (X).(TwoTypes.U) applies within its own resolved expansion of (X).(TwoTypes.U)*
 fn F[X:! TwoTypes where .U = .U* and .T = .U]() {}
 
 fn Main() -> i32 {

explorer/testdata/assoc_const/fail_unknown_value.carbon

@@ -11,7 +11,7 @@ interface Iface { let N:! i32; }
 fn PickType(N: i32) -> type { return i32; }
 
 fn F[T:! Iface](x: T) -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_unknown_value.carbon:[[@LINE+1]]: value of associated constant (T).(Iface.N) is not known
+  // CHECK:STDERR: COMPILATION ERROR: fail_unknown_value.carbon:[[@LINE+1]]: value of associated constant (T).(Iface.N) is not known
   var x: PickType(T.N) = 0;
   return x;
 }

explorer/testdata/assoc_const/fail_unknown_value_specified_in_constraint.carbon

@@ -12,7 +12,7 @@ fn PickType(N: i32) -> type { return i32; }
 
 fn F[T:! Iface where .N == 5](x: T) -> i32 {
   // TODO: This should be valid: the value of T.N is known to be 5 here.
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/assoc_const/fail_unknown_value_specified_in_constraint.carbon:[[@LINE+1]]: value of associated constant (T).(Iface.N) is not known
+  // CHECK:STDERR: COMPILATION ERROR: fail_unknown_value_specified_in_constraint.carbon:[[@LINE+1]]: value of associated constant (T).(Iface.N) is not known
   var x: PickType(T.N) = 0;
   return x;
 }

explorer/testdata/auto/fail_use_in_init.carbon

@@ -8,7 +8,7 @@ package ExplorerTest api;
 
 fn Main() -> i32 {
   // TODO: The error here should be that we aren't allowed to refer to 'a' yet.
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/auto/fail_use_in_init.carbon:[[@LINE+1]]: could not resolve 'a'
+  // CHECK:STDERR: COMPILATION ERROR: fail_use_in_init.carbon:[[@LINE+1]]: could not resolve 'a'
   var a: auto = a;
   return 0;
 }

explorer/testdata/basic_syntax/fail_alternative_not_type.carbon

@@ -6,7 +6,7 @@
 
 package ExplorerTest api;
 
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/basic_syntax/fail_alternative_not_type.carbon:[[@LINE+1]]: type error in type expression: '(i32,)' is not implicitly convertible to 'type'
+// CHECK:STDERR: COMPILATION ERROR: fail_alternative_not_type.carbon:[[@LINE+1]]: type error in type expression: '(i32,)' is not implicitly convertible to 'type'
 choice C { X(42) }
 
 fn Main() -> i32 {

explorer/testdata/basic_syntax/fail_alternative_uses_choice.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 choice Ch {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/basic_syntax/fail_alternative_uses_choice.carbon:[[@LINE+1]]: 'Ch' is not usable until after it has been completely declared
+  // CHECK:STDERR: COMPILATION ERROR: fail_alternative_uses_choice.carbon:[[@LINE+1]]: 'Ch' is not usable until after it has been completely declared
   Opt(Ch)
 }
 

explorer/testdata/basic_syntax/fail_assign_to_function.carbon

@@ -10,7 +10,7 @@ fn F() {}
 fn G() {}
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/basic_syntax/fail_assign_to_function.carbon:[[@LINE+1]]: Only a reference expression can be assigned to, but got `F`
+  // CHECK:STDERR: COMPILATION ERROR: fail_assign_to_function.carbon:[[@LINE+1]]: Only a reference expression can be assigned to, but got `F`
   F = G;
   return 0;
 }

explorer/testdata/basic_syntax/fail_assign_to_rval.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/basic_syntax/fail_assign_to_rval.carbon:[[@LINE+1]]: Only a reference expression can be assigned to, but got `1`
+  // CHECK:STDERR: COMPILATION ERROR: fail_assign_to_rval.carbon:[[@LINE+1]]: Only a reference expression can be assigned to, but got `1`
   1 = 0;
   return 0;
 }

explorer/testdata/basic_syntax/fail_block.carbon

@@ -8,7 +8,7 @@ package ExplorerTest api;
 
 fn Main() -> i32 {
   {
-    // CHECK:STDERR: SYNTAX ERROR: explorer/testdata/basic_syntax/fail_block.carbon:[[@LINE+1]]: syntax error, unexpected RETURN, expecting PERIOD or RIGHT_CURLY_BRACE
+    // CHECK:STDERR: SYNTAX ERROR: fail_block.carbon:[[@LINE+1]]: syntax error, unexpected RETURN, expecting PERIOD or RIGHT_CURLY_BRACE
     return 0;
   }
 }

explorer/testdata/basic_syntax/fail_choice_extra_parens.carbon

@@ -13,7 +13,7 @@ choice Ints {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/basic_syntax/fail_choice_extra_parens.carbon:[[@LINE+1]]: alternative `choice Ints.None` does not expect an argument list
+  // CHECK:STDERR: COMPILATION ERROR: fail_choice_extra_parens.carbon:[[@LINE+1]]: alternative `choice Ints.None` does not expect an argument list
   match (Ints.None()) {
     case Ints.None => { return 0; }
     default => { return 1; }

explorer/testdata/basic_syntax/fail_choice_no_parens.carbon

@@ -15,7 +15,7 @@ choice Ints {
 fn Main() -> i32 {
   match (Ints.None) {
     case Ints.None() => { return 0; }
-    // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/basic_syntax/fail_choice_no_parens.carbon:[[@LINE+3]]: type error in `match` pattern type
+    // CHECK:STDERR: COMPILATION ERROR: fail_choice_no_parens.carbon:[[@LINE+3]]: type error in `match` pattern type
     // CHECK:STDERR: expected: choice Ints
     // CHECK:STDERR: actual: fn () -> choice Ints
     default => { return 1; }

explorer/testdata/basic_syntax/fail_choice_pattern_extra_parens.carbon

@@ -14,7 +14,7 @@ choice Ints {
 
 fn Main() -> i32 {
   match (Ints.None) {
-    // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/basic_syntax/fail_choice_pattern_extra_parens.carbon:[[@LINE+1]]: alternative `choice Ints.None` does not expect an argument list
+    // CHECK:STDERR: COMPILATION ERROR: fail_choice_pattern_extra_parens.carbon:[[@LINE+1]]: alternative `choice Ints.None` does not expect an argument list
     case Ints.None() => { return 0; }
     default => { return 1; }
   }

explorer/testdata/basic_syntax/fail_choice_pattern_no_parens.carbon

@@ -15,7 +15,7 @@ choice Ints {
 fn Main() -> i32 {
   match (Ints.None()) {
     case Ints.None => { return 0; }
-    // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/basic_syntax/fail_choice_pattern_no_parens.carbon:[[@LINE+3]]: type error in `match` pattern type
+    // CHECK:STDERR: COMPILATION ERROR: fail_choice_pattern_no_parens.carbon:[[@LINE+3]]: type error in `match` pattern type
     // CHECK:STDERR: expected: fn () -> choice Ints
     // CHECK:STDERR: actual: choice Ints
     default => { return 1; }

explorer/testdata/basic_syntax/fail_compare_precedence.carbon

@@ -7,6 +7,6 @@
 package ExplorerTest api;
 
 fn CompareBools(a: bool, b: bool) -> bool {
-  // CHECK:STDERR: SYNTAX ERROR: explorer/testdata/basic_syntax/fail_compare_precedence.carbon:[[@LINE+1]]: syntax error, unexpected EQUAL_EQUAL, expecting SEMICOLON
+  // CHECK:STDERR: SYNTAX ERROR: fail_compare_precedence.carbon:[[@LINE+1]]: syntax error, unexpected EQUAL_EQUAL, expecting SEMICOLON
   return not a == b;
 }

explorer/testdata/basic_syntax/fail_invalid_char.carbon

@@ -4,5 +4,5 @@
 //
 // AUTOUPDATE
 
-// CHECK:STDERR: SYNTAX ERROR: explorer/testdata/basic_syntax/fail_invalid_char.carbon:[[@LINE+1]]: invalid character '\xEF' in source file.
+// CHECK:STDERR: SYNTAX ERROR: fail_invalid_char.carbon:[[@LINE+1]]: invalid character '\xEF' in source file.
 �

explorer/testdata/basic_syntax/fail_invalid_integer.carbon

@@ -7,6 +7,6 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: SYNTAX ERROR: explorer/testdata/basic_syntax/fail_invalid_integer.carbon:[[@LINE+1]]: Invalid integer literal: 11111111111111111111111111
+  // CHECK:STDERR: SYNTAX ERROR: fail_invalid_integer.carbon:[[@LINE+1]]: Invalid integer literal: 11111111111111111111111111
   return 11111111111111111111111111;
 }

explorer/testdata/basic_syntax/fail_invalid_integer_type.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: SYNTAX ERROR: explorer/testdata/basic_syntax/fail_invalid_integer_type.carbon:[[@LINE+1]]: Invalid type literal: i11111111111111111111111111
+  // CHECK:STDERR: SYNTAX ERROR: fail_invalid_integer_type.carbon:[[@LINE+1]]: Invalid type literal: i11111111111111111111111111
   var x: i11111111111111111111111111 = 1;
   return 0;
 }

explorer/testdata/basic_syntax/fail_unimplemented_example.carbon

@@ -7,6 +7,6 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/basic_syntax/fail_unimplemented_example.carbon:[[@LINE+1]]: Unimplemented
+  // CHECK:STDERR: COMPILATION ERROR: fail_unimplemented_example.carbon:[[@LINE+1]]: Unimplemented
   return 1 __unimplemented_example_infix 2;
 }

explorer/testdata/basic_syntax/fail_unknown_intrinsic.carbon

@@ -7,6 +7,6 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: SYNTAX ERROR: explorer/testdata/basic_syntax/fail_unknown_intrinsic.carbon:[[@LINE+1]]: Unknown intrinsic 'nonexistent'
+  // CHECK:STDERR: SYNTAX ERROR: fail_unknown_intrinsic.carbon:[[@LINE+1]]: Unknown intrinsic 'nonexistent'
   return __intrinsic_nonexistent();
 }

explorer/testdata/basic_syntax/fail_unsupported_integer_type.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: SYNTAX ERROR: explorer/testdata/basic_syntax/fail_unsupported_integer_type.carbon:[[@LINE+1]]: Only i32 is supported for now: i64
+  // CHECK:STDERR: SYNTAX ERROR: fail_unsupported_integer_type.carbon:[[@LINE+1]]: Only i32 is supported for now: i64
   var x: i64 = 1;
   return 0;
 }

explorer/testdata/choice/fail_recursive_use.carbon

@@ -8,7 +8,7 @@ package ExplorerTest api;
 
 choice C {
   X,
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/choice/fail_recursive_use.carbon:[[@LINE+1]]: 'C' is not usable until after it has been completely declared
+  // CHECK:STDERR: COMPILATION ERROR: fail_recursive_use.carbon:[[@LINE+1]]: 'C' is not usable until after it has been completely declared
   Y(if C.X then i32 else i32)
 }
 

explorer/testdata/class/fail_abstract_method_not_supported.carbon

@@ -12,7 +12,7 @@ base class C {
 class D extends C {
   abstract fn Foo[self:Self]() -> i32 {
     return 1;
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_abstract_method_not_supported.carbon:[[@LINE+1]]: Error declaring `Foo`: `abstract` methods are not yet supported.
+  // CHECK:STDERR: COMPILATION ERROR: fail_abstract_method_not_supported.carbon:[[@LINE+1]]: Error declaring `Foo`: `abstract` methods are not yet supported.
   }
 }
 

explorer/testdata/class/fail_call_method_before_typecheck.carbon

@@ -8,7 +8,7 @@ package ExplorerTest api;
 
 class A {
   fn F[self: Self]() -> type {
-    // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_call_method_before_typecheck.carbon:[[@LINE+1]]: attempt to call function `F` that has not been fully type-checked
+    // CHECK:STDERR: COMPILATION ERROR: fail_call_method_before_typecheck.carbon:[[@LINE+1]]: attempt to call function `F` that has not been fully type-checked
     var a: ({} as A).F() = 0;
     return i32;
   }

explorer/testdata/class/fail_call_undefined_method.carbon

@@ -12,6 +12,6 @@ class A {
 
 fn Main() -> i32 {
   var a: A = {};
-  // CHECK:STDERR: RUNTIME ERROR: explorer/testdata/class/fail_call_undefined_method.carbon:[[@LINE+1]]: attempt to call function `F` that has not been defined
+  // CHECK:STDERR: RUNTIME ERROR: fail_call_undefined_method.carbon:[[@LINE+1]]: attempt to call function `F` that has not been defined
   return a.F();
 }

explorer/testdata/class/fail_class_named_self.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 // Error: Can't use keyword `Self` as the name of a class.
-// CHECK:STDERR: SYNTAX ERROR: explorer/testdata/class/fail_class_named_self.carbon:[[@LINE+1]]: syntax error, unexpected SELF, expecting identifier or LEFT_PARENTHESIS
+// CHECK:STDERR: SYNTAX ERROR: fail_class_named_self.carbon:[[@LINE+1]]: syntax error, unexpected SELF, expecting identifier or LEFT_PARENTHESIS
 class Self {
   var x: i32;
   var y: i32;

explorer/testdata/class/fail_direct_base_class_init.carbon

@@ -15,7 +15,7 @@ class B extends A {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_direct_base_class_init.carbon:[[@LINE+1]]: type error in initializer of variable: '{.a: i32, .b: i32}' is not implicitly convertible to 'class B'
+  // CHECK:STDERR: COMPILATION ERROR: fail_direct_base_class_init.carbon:[[@LINE+1]]: type error in initializer of variable: '{.a: i32, .b: i32}' is not implicitly convertible to 'class B'
   var b: B = {.a=0, .b=1};
   return 0;
 }

explorer/testdata/class/fail_extends_final_class.carbon

@@ -12,7 +12,7 @@ class C {
 
 class D extends C {
   fn G() {}
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_extends_final_class.carbon:[[@LINE+1]]: Base class `C` is `final` and cannot be inherited. Add the `base` or `abstract` class prefix to `C` to allow it to be inherited
+// CHECK:STDERR: COMPILATION ERROR: fail_extends_final_class.carbon:[[@LINE+1]]: Base class `C` is `final` and cannot be inherited. Add the `base` or `abstract` class prefix to `C` to allow it to be inherited
 }
 
 fn Main() -> i32 {

explorer/testdata/class/fail_extends_non_class.carbon

@@ -6,7 +6,7 @@
 
 package ExplorerTest api;
 
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_extends_non_class.carbon:[[@LINE+1]]: type error in type expression: 'i32' is not implicitly convertible to 'type'
+// CHECK:STDERR: COMPILATION ERROR: fail_extends_non_class.carbon:[[@LINE+1]]: type error in type expression: 'i32' is not implicitly convertible to 'type'
 class C extends 3 {
   var x: i32;
   var y: i32;

explorer/testdata/class/fail_field_access_mismatch.carbon

@@ -13,6 +13,6 @@ class Point {
 
 fn Main() -> i32 {
   var p: Point = {.x = 1, .y = 2};
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_field_access_mismatch.carbon:[[@LINE+1]]: class Point does not have a field named z
+  // CHECK:STDERR: COMPILATION ERROR: fail_field_access_mismatch.carbon:[[@LINE+1]]: class Point does not have a field named z
   return p.z - 1;
 }

explorer/testdata/class/fail_field_access_mismatch_base.carbon

@@ -17,6 +17,6 @@ class Point3D extends Point {
 
 fn Main() -> i32 {
   var p: Point3D = {.base={.x = 1, .y = 2}, .z = 3};
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_field_access_mismatch_base.carbon:[[@LINE+1]]: class Point3D does not have a field named a
+  // CHECK:STDERR: COMPILATION ERROR: fail_field_access_mismatch_base.carbon:[[@LINE+1]]: class Point3D does not have a field named a
   return p.a;
 }

explorer/testdata/class/fail_field_assign_mismatch_base.carbon

@@ -17,7 +17,7 @@ class Point3D extends Point {
 
 fn Main() -> i32 {
   var p: Point3D = {.base={.x = 1, .y = 2}, .z = 3};
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_field_assign_mismatch_base.carbon:[[@LINE+1]]: class Point3D does not have a field named a
+  // CHECK:STDERR: COMPILATION ERROR: fail_field_assign_mismatch_base.carbon:[[@LINE+1]]: class Point3D does not have a field named a
   p.a = 0;
   return 0;
 }

explorer/testdata/class/fail_field_mismatch.carbon

@@ -12,7 +12,7 @@ class Point {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_field_mismatch.carbon:[[@LINE+1]]: type error in initializer of variable: '{.x: i32, .z: i32}' is not implicitly convertible to 'class Point'
+  // CHECK:STDERR: COMPILATION ERROR: fail_field_mismatch.carbon:[[@LINE+1]]: type error in initializer of variable: '{.x: i32, .z: i32}' is not implicitly convertible to 'class Point'
   var p: Point = {.x = 1, .z = 2};
   return p.x - 1;
 }

explorer/testdata/class/fail_field_missing.carbon

@@ -12,7 +12,7 @@ class Point {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_field_missing.carbon:[[@LINE+1]]: type error in initializer of variable: '{.x: i32}' is not implicitly convertible to 'class Point'
+  // CHECK:STDERR: COMPILATION ERROR: fail_field_missing.carbon:[[@LINE+1]]: type error in initializer of variable: '{.x: i32}' is not implicitly convertible to 'class Point'
   var p: Point = {.x = 1};
   return p.x - 1;
 }

explorer/testdata/class/fail_impl_method_not_existing.carbon

@@ -12,7 +12,7 @@ base class C {
 class D extends C {
   impl fn Foo[self:Self]() -> i32 {
     return 1;
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_impl_method_not_existing.carbon:[[@LINE+1]]: Error declaring `Foo`: cannot override a method that is not declared `abstract` or `virtual` in base class.
+  // CHECK:STDERR: COMPILATION ERROR: fail_impl_method_not_existing.carbon:[[@LINE+1]]: Error declaring `Foo`: cannot override a method that is not declared `abstract` or `virtual` in base class.
   }
 }
 

explorer/testdata/class/fail_impl_method_not_virtual.carbon

@@ -15,7 +15,7 @@ base class C {
 class D extends C {
   impl fn Foo[self:Self]() -> i32 {
     return 1;
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_impl_method_not_virtual.carbon:[[@LINE+1]]: Error declaring `Foo`: cannot override a method that is not declared `abstract` or `virtual` in base class.
+  // CHECK:STDERR: COMPILATION ERROR: fail_impl_method_not_virtual.carbon:[[@LINE+1]]: Error declaring `Foo`: cannot override a method that is not declared `abstract` or `virtual` in base class.
   }
 }
 

explorer/testdata/class/fail_instantiate_abstract_class_constructor.carbon

@@ -15,7 +15,7 @@ abstract class C {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_instantiate_abstract_class_constructor.carbon:[[@LINE+1]]: Cannot instantiate abstract class C
+  // CHECK:STDERR: COMPILATION ERROR: fail_instantiate_abstract_class_constructor.carbon:[[@LINE+1]]: Cannot instantiate abstract class C
   var c: C = C.Create();
   return 0;
 }

explorer/testdata/class/fail_instantiate_abstract_class_empty.carbon

@@ -11,7 +11,7 @@ abstract class C {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_instantiate_abstract_class_empty.carbon:[[@LINE+1]]: Cannot instantiate abstract class C
+  // CHECK:STDERR: COMPILATION ERROR: fail_instantiate_abstract_class_empty.carbon:[[@LINE+1]]: Cannot instantiate abstract class C
   var c: C;
   return 0;
 }

explorer/testdata/class/fail_instantiate_abstract_class_struct.carbon

@@ -11,7 +11,7 @@ abstract class C {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_instantiate_abstract_class_struct.carbon:[[@LINE+1]]: Cannot instantiate abstract class C
+  // CHECK:STDERR: COMPILATION ERROR: fail_instantiate_abstract_class_struct.carbon:[[@LINE+1]]: Cannot instantiate abstract class C
   var c: C = { .a = 1 };
   return 0;
 }

explorer/testdata/class/fail_invalid_subtyping.carbon

@@ -14,7 +14,7 @@ class D {
 
 fn Main() -> i32 {
   var d: D = {};
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_invalid_subtyping.carbon:[[@LINE+1]]: type error in initializer of variable: 'class D*' is not implicitly convertible to 'class C*'
+  // CHECK:STDERR: COMPILATION ERROR: fail_invalid_subtyping.carbon:[[@LINE+1]]: type error in initializer of variable: 'class D*' is not implicitly convertible to 'class C*'
   var c: C* = &d;
   return 0;
 }

explorer/testdata/class/fail_member_call_before_typecheck.carbon

@@ -10,7 +10,7 @@ class C {
   fn PickType() -> type { return i32; }
   // This is invalid even though `PickType` is defined earlier, because
   // checking of member bodies is deferred until after the class is completed.
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_member_call_before_typecheck.carbon:[[@LINE+1]]: attempt to call function `PickType` that has not been fully type-checked
+  // CHECK:STDERR: COMPILATION ERROR: fail_member_call_before_typecheck.carbon:[[@LINE+1]]: attempt to call function `PickType` that has not been fully type-checked
   fn GetZero() -> PickType() { return 0; }
 }
 

explorer/testdata/class/fail_member_of_self.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 class C {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_member_of_self.carbon:[[@LINE+1]]: incomplete type `class C` used in type of variable
+  // CHECK:STDERR: COMPILATION ERROR: fail_member_of_self.carbon:[[@LINE+1]]: incomplete type `class C` used in type of variable
   var m: Self;
 }
 

explorer/testdata/class/fail_method_deduced.carbon

@@ -15,7 +15,7 @@ fn H[T:! type](x: T) {}
 
 fn Main() -> i32 {
   H(C.F);
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_method_deduced.carbon:[[@LINE+1]]: member name G can only be used in a member access or alias
+  // CHECK:STDERR: COMPILATION ERROR: fail_method_deduced.carbon:[[@LINE+1]]: member name G can only be used in a member access or alias
   H(C.G);
   return 0;
 }

explorer/testdata/class/fail_method_from_class.carbon

@@ -20,6 +20,6 @@ class Point {
 }
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_method_from_class.carbon:[[@LINE+1]]: in call `Point.GetX()`, expected callee to be a function, found `member name GetX`
+  // CHECK:STDERR: COMPILATION ERROR: fail_method_from_class.carbon:[[@LINE+1]]: in call `Point.GetX()`, expected callee to be a function, found `member name GetX`
   return Point.GetX();
 }

explorer/testdata/class/fail_method_in_var.carbon

@@ -13,7 +13,7 @@ class C {
 
 fn Main() -> i32 {
   var f: auto = C.F;
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_method_in_var.carbon:[[@LINE+1]]: member name G can only be used in a member access or alias
+  // CHECK:STDERR: COMPILATION ERROR: fail_method_in_var.carbon:[[@LINE+1]]: member name G can only be used in a member access or alias
   var g: auto = C.G;
 
   return 0;

explorer/testdata/class/fail_override_virtual_with_non_virtual.carbon

@@ -11,7 +11,7 @@ base class A {
 }
 
 class B extends A {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_override_virtual_with_non_virtual.carbon:[[@LINE+1]]: Error declaring `Foo`: method is declared virtual in base class, use `impl` to override it.
+  // CHECK:STDERR: COMPILATION ERROR: fail_override_virtual_with_non_virtual.carbon:[[@LINE+1]]: Error declaring `Foo`: method is declared virtual in base class, use `impl` to override it.
   fn Foo[self: Self]() {}
 }
 

explorer/testdata/class/fail_qualified_method.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 class Point {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_qualified_method.carbon:[[@LINE+1]]: qualified declaration names are not permitted in this context
+  // CHECK:STDERR: COMPILATION ERROR: fail_qualified_method.carbon:[[@LINE+1]]: qualified declaration names are not permitted in this context
   fn Point.F[self: Self]() {}
 }
 

explorer/testdata/class/fail_redeclare_virtual_method.carbon

@@ -11,7 +11,7 @@ base class C {
 }
 
 class D extends C {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_redeclare_virtual_method.carbon:[[@LINE+1]]: Error declaring `Foo`: method is declared virtual in base class, use `impl` to override it.
+  // CHECK:STDERR: COMPILATION ERROR: fail_redeclare_virtual_method.carbon:[[@LINE+1]]: Error declaring `Foo`: method is declared virtual in base class, use `impl` to override it.
   virtual fn Foo[self:Self]() {}
 }
 

explorer/testdata/class/fail_return_method.carbon

@@ -12,7 +12,7 @@ class C {
 }
 
 fn ReturnF() -> auto { return C.F; }
-// CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_return_method.carbon:[[@LINE+1]]: member name G can only be used in a member access or alias
+// CHECK:STDERR: COMPILATION ERROR: fail_return_method.carbon:[[@LINE+1]]: member name G can only be used in a member access or alias
 fn ReturnG() -> auto { return C.G; }
 
 fn Main() -> i32 {

explorer/testdata/class/fail_use_before_typecheck.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 class C {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_use_before_typecheck.carbon:[[@LINE+1]]: incomplete type `class C` used in member access
+  // CHECK:STDERR: COMPILATION ERROR: fail_use_before_typecheck.carbon:[[@LINE+1]]: incomplete type `class C` used in member access
   var n: if not C.WrapInStruct() then i32 else {.n: i32};
   fn WrapInStruct() -> bool { return true; }
 }

explorer/testdata/class/fail_virtual_class_function.carbon

@@ -9,7 +9,7 @@ package ExplorerTest api;
 class C {
   virtual fn Foo() -> i32 {
     return 1;
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_virtual_class_function.carbon:[[@LINE+1]]: Error declaring `Foo`: class functions cannot be virtual.
+  // CHECK:STDERR: COMPILATION ERROR: fail_virtual_class_function.carbon:[[@LINE+1]]: Error declaring `Foo`: class functions cannot be virtual.
   }
 }
 

explorer/testdata/class/fail_virtual_method_absent.carbon

@@ -17,6 +17,6 @@ fn Main() -> i32 {
   var bp: B* = &b;
   var ap: A* = bp;
   // Shouldn't look into the vtable for B.
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/class/fail_virtual_method_absent.carbon:[[@LINE+1]]: class A does not have a field named Foo
+  // CHECK:STDERR: COMPILATION ERROR: fail_virtual_method_absent.carbon:[[@LINE+1]]: class A does not have a field named Foo
   return ap->Foo();
 }

explorer/testdata/comparison/fail_no_impl.carbon

@@ -7,7 +7,7 @@
 package ExplorerTest api;
 
 fn Main() -> i32 {
-  // CHECK:STDERR: COMPILATION ERROR: explorer/testdata/comparison/fail_no_impl.carbon:[[@LINE+1]]: i32 is not equality comparable with String (could not find implementation of interface EqWith(U = String) for i32)
+  // CHECK:STDERR: COMPILATION ERROR: fail_no_impl.carbon:[[@LINE+1]]: i32 is not equality comparable with String (could not find implementation of interface EqWith(U = String) for i32)
   Print("different types equal: {0}", if 1 == "1" then 1 else 0);
   return 0;
 }