Rename check/testdata/tuples to remove the plural (#4200)

This is just odd since other dirs aren't plural (struct, not structs),
and we do have parse/testdata/tuple

toolchain/check/testdata/tuples/fail_assign_nested.carbon → toolchain/check/testdata/tuple/fail_assign_nested.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/fail_assign_nested.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/fail_assign_nested.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/fail_assign_nested.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/fail_assign_nested.carbon
 
 // CHECK:STDERR: fail_assign_nested.carbon:[[@LINE+3]]:36: ERROR: Cannot initialize tuple of 2 element(s) from tuple with 3 element(s).
 // CHECK:STDERR: var x: ((i32, i32), (i32, i32)) = ((1, 2, 3), (4, 5, 6));

toolchain/check/testdata/tuples/fail_element_type_mismatch.carbon → toolchain/check/testdata/tuple/fail_element_type_mismatch.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/fail_element_type_mismatch.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/fail_element_type_mismatch.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/fail_element_type_mismatch.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/fail_element_type_mismatch.carbon
 
 // CHECK:STDERR: fail_element_type_mismatch.carbon:[[@LINE+3]]:21: ERROR: Cannot implicitly convert from `f64` to `i32`.
 // CHECK:STDERR: var x: (i32, i32) = (2, 65.89);

toolchain/check/testdata/tuples/fail_nested_incomplete.carbon → toolchain/check/testdata/tuple/fail_nested_incomplete.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/fail_nested_incomplete.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/fail_nested_incomplete.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/fail_nested_incomplete.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/fail_nested_incomplete.carbon
 
 class Incomplete;
 

toolchain/check/testdata/tuples/fail_too_few_element.carbon → toolchain/check/testdata/tuple/fail_too_few_element.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/fail_too_few_element.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/fail_too_few_element.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/fail_too_few_element.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/fail_too_few_element.carbon
 
 // CHECK:STDERR: fail_too_few_element.carbon:[[@LINE+3]]:21: ERROR: Cannot initialize tuple of 2 element(s) from tuple with 1 element(s).
 // CHECK:STDERR: var x: (i32, i32) = (2, );

toolchain/check/testdata/tuples/fail_type_assign.carbon → toolchain/check/testdata/tuple/fail_type_assign.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/fail_type_assign.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/fail_type_assign.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/fail_type_assign.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/fail_type_assign.carbon
 
 // CHECK:STDERR: fail_type_assign.carbon:[[@LINE+3]]:18: ERROR: Cannot implicitly convert from `type` to `i32`.
 // CHECK:STDERR: var x: (i32, ) = (i32, );

toolchain/check/testdata/tuples/fail_value_as_type.carbon → toolchain/check/testdata/tuple/fail_value_as_type.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/fail_value_as_type.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/fail_value_as_type.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/fail_value_as_type.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/fail_value_as_type.carbon
 
 // CHECK:STDERR: fail_value_as_type.carbon:[[@LINE+3]]:8: ERROR: Cannot implicitly convert from `i32` to `type`.
 // CHECK:STDERR: var x: (1, );

toolchain/check/testdata/tuples/import.carbon → toolchain/check/testdata/tuple/import.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/import.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/import.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/import.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/import.carbon
 
 // --- implicit.carbon
 

toolchain/check/testdata/tuples/nested_tuple.carbon → toolchain/check/testdata/tuple/nested_tuple.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/nested_tuple.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/nested_tuple.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/nested_tuple.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/nested_tuple.carbon
 
 var x: ((i32, i32), i32) = ((12, 76), 6);
 

toolchain/check/testdata/tuples/nested_tuple_in_place.carbon → toolchain/check/testdata/tuple/nested_tuple_in_place.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/nested_tuple_in_place.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/nested_tuple_in_place.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/nested_tuple_in_place.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/nested_tuple_in_place.carbon
 
 fn F() -> (i32, i32, i32);
 

toolchain/check/testdata/tuples/no_prelude/empty.carbon → toolchain/check/testdata/tuple/no_prelude/empty.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/no_prelude/empty.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/no_prelude/empty.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/no_prelude/empty.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/no_prelude/empty.carbon
 
 var x: () = ();
 var y: () = x;

toolchain/check/testdata/tuples/no_prelude/fail_assign_empty.carbon → toolchain/check/testdata/tuple/no_prelude/fail_assign_empty.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/no_prelude/fail_assign_empty.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/no_prelude/fail_assign_empty.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/no_prelude/fail_assign_empty.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/no_prelude/fail_assign_empty.carbon
 
 // CHECK:STDERR: fail_assign_empty.carbon:[[@LINE+3]]:16: ERROR: Cannot initialize tuple of 1 element(s) from tuple with 0 element(s).
 // CHECK:STDERR: var x: ((),) = ();

toolchain/check/testdata/tuples/no_prelude/fail_assign_to_empty.carbon → toolchain/check/testdata/tuple/no_prelude/fail_assign_to_empty.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/no_prelude/fail_assign_to_empty.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/no_prelude/fail_assign_to_empty.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/no_prelude/fail_assign_to_empty.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/no_prelude/fail_assign_to_empty.carbon
 
 // CHECK:STDERR: fail_assign_to_empty.carbon:[[@LINE+3]]:13: ERROR: Cannot initialize tuple of 0 element(s) from tuple with 1 element(s).
 // CHECK:STDERR: var x: () = ((),);

toolchain/check/testdata/tuples/one_element.carbon → toolchain/check/testdata/tuple/one_element.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/one_element.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/one_element.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/one_element.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/one_element.carbon
 
 var x: (i32,) = (4,);
 var y: (i32,) = x;

toolchain/check/testdata/tuples/two_elements.carbon → toolchain/check/testdata/tuple/two_elements.carbon

@@ -4,9 +4,9 @@
 //
 // AUTOUPDATE
 // TIP: To test this file alone, run:
-// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuples/two_elements.carbon
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/tuple/two_elements.carbon
 // TIP: To dump output, run:
-// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuples/two_elements.carbon
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/tuple/two_elements.carbon
 
 let v: (i32, i32) = (4, 102);
 let w: (i32, i32) = v;