C++ Interop: Add test coverage for access control of static/instance data/function members (#6199)

This demonstrates two issues:
1. It seems like we wrongly treat private static data members the same
way we treat protected and allow access to them from within derived
classes member functions.
2. Calling instance member functions of a base C++ class using a derived
class as self (no implicit upcast) is not yet supported. This isn't
related to access control, but prevents us from testing some access
control use cases.

Part of #5859.

toolchain/check/testdata/interop/cpp/class/access.carbon

@@ -17,7 +17,8 @@
 // --- non_function_member_public.h
 
 struct S {
-  int x;
+  int instance_data;
+  static int static_data;
 };
 
 // --- import_non_function_member_public.carbon
@@ -28,7 +29,8 @@ import Cpp library "non_function_member_public.h";
 
 fn F(s: Cpp.S) {
   //@dump-sem-ir-begin
-  let x: i32 = s.x;
+  let instance_data: i32 = s.instance_data;
+  let static_data: i32 = Cpp.S.static_data;
   //@dump-sem-ir-end
 }
 
@@ -44,7 +46,8 @@ class Derived {
 
 fn F(d: Derived) {
   //@dump-sem-ir-begin
-  let x: i32 = d.x;
+  let instance_data: i32 = d.instance_data;
+  let static_data: i32 = Derived.static_data;
   //@dump-sem-ir-end
 }
 
@@ -56,7 +59,8 @@ fn F(d: Derived) {
 
 class C {
  protected:
-  int x;
+  int instance_data;
+  static int static_data;
 };
 
 // --- fail_import_non_function_member_protected.carbon
@@ -66,15 +70,23 @@ library "[[@TEST_NAME]]";
 import Cpp library "non_function_member_protected.h";
 
 fn F(c: Cpp.C) {
-  // CHECK:STDERR: fail_import_non_function_member_protected.carbon:[[@LINE+8]]:16: error: cannot access protected member `x` of type `Cpp.C` [ClassInvalidMemberAccess]
-  // CHECK:STDERR:   let x: i32 = c.x;
-  // CHECK:STDERR:                ^~~
+  // CHECK:STDERR: fail_import_non_function_member_protected.carbon:[[@LINE+8]]:28: error: cannot access protected member `instance_data` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   let instance_data: i32 = c.instance_data;
+  // CHECK:STDERR:                            ^~~~~~~~~~~~~~~
   // CHECK:STDERR: fail_import_non_function_member_protected.carbon:[[@LINE-6]]:10: in file included here [InCppInclude]
   // CHECK:STDERR: ./non_function_member_protected.h:2:7: note: declared here [ClassMemberDeclaration]
   // CHECK:STDERR: class C {
   // CHECK:STDERR:       ^
   // CHECK:STDERR:
-  let x: i32 = c.x;
+  let instance_data: i32 = c.instance_data;
+  // CHECK:STDERR: fail_import_non_function_member_protected.carbon:[[@LINE+7]]:26: error: cannot access protected member `static_data` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   let static_data: i32 = Cpp.C.static_data;
+  // CHECK:STDERR:                          ^~~~~~~~~~~~~~~~~
+  // CHECK:STDERR: fail_import_non_function_member_protected.carbon:[[@LINE+4]]:26: note: declared here [ClassMemberDeclaration]
+  // CHECK:STDERR:   let static_data: i32 = Cpp.C.static_data;
+  // CHECK:STDERR:                          ^~~~~~~~~~~~~~~~~
+  // CHECK:STDERR:
+  let static_data: i32 = Cpp.C.static_data;
 }
 
 // --- fail_import_non_function_member_protected_extend.carbon
@@ -88,15 +100,41 @@ class Derived {
 }
 
 fn F(d: Derived) {
-  // CHECK:STDERR: fail_import_non_function_member_protected_extend.carbon:[[@LINE+8]]:16: error: cannot access protected member `x` of type `Derived` [ClassInvalidMemberAccess]
-  // CHECK:STDERR:   let x: i32 = d.x;
-  // CHECK:STDERR:                ^~~
+  // CHECK:STDERR: fail_import_non_function_member_protected_extend.carbon:[[@LINE+8]]:28: error: cannot access protected member `instance_data` of type `Derived` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   let instance_data: i32 = d.instance_data;
+  // CHECK:STDERR:                            ^~~~~~~~~~~~~~~
   // CHECK:STDERR: fail_import_non_function_member_protected_extend.carbon:[[@LINE-10]]:10: in file included here [InCppInclude]
   // CHECK:STDERR: ./non_function_member_protected.h:2:7: note: declared here [ClassMemberDeclaration]
   // CHECK:STDERR: class C {
   // CHECK:STDERR:       ^
   // CHECK:STDERR:
-  let x: i32 = d.x;
+  let instance_data: i32 = d.instance_data;
+  // CHECK:STDERR: fail_import_non_function_member_protected_extend.carbon:[[@LINE+7]]:26: error: cannot access protected member `static_data` of type `Derived` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   let static_data: i32 = Derived.static_data;
+  // CHECK:STDERR:                          ^~~~~~~~~~~~~~~~~~~
+  // CHECK:STDERR: fail_import_non_function_member_protected_extend.carbon:[[@LINE+4]]:26: note: declared here [ClassMemberDeclaration]
+  // CHECK:STDERR:   let static_data: i32 = Derived.static_data;
+  // CHECK:STDERR:                          ^~~~~~~~~~~~~~~~~~~
+  // CHECK:STDERR:
+  let static_data: i32 = Derived.static_data;
+}
+
+// --- import_non_function_member_protected_extend_call_in_member.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "non_function_member_protected.h";
+
+class Derived {
+  extend base: Cpp.C;
+  fn F[self: Self]() {
+    //@dump-sem-ir-begin
+    let instance_data: i32 = self.instance_data;
+    let unqualified_static_data: i32 = static_data;
+    let derived_static_data: i32 = Derived.static_data;
+    let base_static_data: i32 = Cpp.C.static_data;
+    //@dump-sem-ir-end
+  }
 }
 
 // ============================================================================
@@ -106,7 +144,8 @@ fn F(d: Derived) {
 // --- non_function_member_private.h
 
 class C {
-  int x;
+  int instance_data;
+  static int static_data;
 };
 
 // --- fail_import_non_function_member_private.carbon
@@ -116,15 +155,23 @@ library "[[@TEST_NAME]]";
 import Cpp library "non_function_member_private.h";
 
 fn F(c: Cpp.C) {
-  // CHECK:STDERR: fail_import_non_function_member_private.carbon:[[@LINE+8]]:16: error: cannot access private member `x` of type `Cpp.C` [ClassInvalidMemberAccess]
-  // CHECK:STDERR:   let x: i32 = c.x;
-  // CHECK:STDERR:                ^~~
+  // CHECK:STDERR: fail_import_non_function_member_private.carbon:[[@LINE+8]]:28: error: cannot access private member `instance_data` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   let instance_data: i32 = c.instance_data;
+  // CHECK:STDERR:                            ^~~~~~~~~~~~~~~
   // CHECK:STDERR: fail_import_non_function_member_private.carbon:[[@LINE-6]]:10: in file included here [InCppInclude]
   // CHECK:STDERR: ./non_function_member_private.h:2:7: note: declared here [ClassMemberDeclaration]
   // CHECK:STDERR: class C {
   // CHECK:STDERR:       ^
   // CHECK:STDERR:
-  let x: i32 = c.x;
+  let instance_data: i32 = c.instance_data;
+  // CHECK:STDERR: fail_import_non_function_member_private.carbon:[[@LINE+7]]:26: error: cannot access private member `static_data` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   let static_data: i32 = Cpp.C.static_data;
+  // CHECK:STDERR:                          ^~~~~~~~~~~~~~~~~
+  // CHECK:STDERR: fail_import_non_function_member_private.carbon:[[@LINE+4]]:26: note: declared here [ClassMemberDeclaration]
+  // CHECK:STDERR:   let static_data: i32 = Cpp.C.static_data;
+  // CHECK:STDERR:                          ^~~~~~~~~~~~~~~~~
+  // CHECK:STDERR:
+  let static_data: i32 = Cpp.C.static_data;
 }
 
 // --- fail_import_non_function_member_private_extend.carbon
@@ -135,18 +182,59 @@ import Cpp library "non_function_member_private.h";
 
 class Derived {
   extend base: Cpp.C;
+  fn F[self: Self]() {
+    // CHECK:STDERR: fail_import_non_function_member_private_extend.carbon:[[@LINE+8]]:30: error: cannot access private member `instance_data` of type `Cpp.C` [ClassInvalidMemberAccess]
+    // CHECK:STDERR:     let instance_data: i32 = self.instance_data;
+    // CHECK:STDERR:                              ^~~~~~~~~~~~~~~~~~
+    // CHECK:STDERR: fail_import_non_function_member_private_extend.carbon:[[@LINE-8]]:10: in file included here [InCppInclude]
+    // CHECK:STDERR: ./non_function_member_private.h:2:7: note: declared here [ClassMemberDeclaration]
+    // CHECK:STDERR: class C {
+    // CHECK:STDERR:       ^
+    // CHECK:STDERR:
+    let instance_data: i32 = self.instance_data;
+  }
 }
 
 fn F(d: Derived) {
-  // CHECK:STDERR: fail_import_non_function_member_private_extend.carbon:[[@LINE+8]]:16: error: cannot access private member `x` of type `Cpp.C` [ClassInvalidMemberAccess]
-  // CHECK:STDERR:   let x: i32 = d.x;
-  // CHECK:STDERR:                ^~~
-  // CHECK:STDERR: fail_import_non_function_member_private_extend.carbon:[[@LINE-10]]:10: in file included here [InCppInclude]
+  // CHECK:STDERR: fail_import_non_function_member_private_extend.carbon:[[@LINE+8]]:28: error: cannot access private member `instance_data` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   let instance_data: i32 = d.instance_data;
+  // CHECK:STDERR:                            ^~~~~~~~~~~~~~~
+  // CHECK:STDERR: fail_import_non_function_member_private_extend.carbon:[[@LINE-21]]:10: in file included here [InCppInclude]
   // CHECK:STDERR: ./non_function_member_private.h:2:7: note: declared here [ClassMemberDeclaration]
   // CHECK:STDERR: class C {
   // CHECK:STDERR:       ^
   // CHECK:STDERR:
-  let x: i32 = d.x;
+  let instance_data: i32 = d.instance_data;
+  // CHECK:STDERR: fail_import_non_function_member_private_extend.carbon:[[@LINE+7]]:34: error: cannot access private member `static_data` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   let derived_static_data: i32 = Derived.static_data;
+  // CHECK:STDERR:                                  ^~~~~~~~~~~~~~~~~~~
+  // CHECK:STDERR: fail_import_non_function_member_private_extend.carbon:[[@LINE+4]]:34: note: declared here [ClassMemberDeclaration]
+  // CHECK:STDERR:   let derived_static_data: i32 = Derived.static_data;
+  // CHECK:STDERR:                                  ^~~~~~~~~~~~~~~~~~~
+  // CHECK:STDERR:
+  let derived_static_data: i32 = Derived.static_data;
+  // CHECK:STDERR: fail_import_non_function_member_private_extend.carbon:[[@LINE+7]]:31: error: cannot access private member `static_data` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   let base_static_data: i32 = Cpp.C.static_data;
+  // CHECK:STDERR:                               ^~~~~~~~~~~~~~~~~
+  // CHECK:STDERR: fail_import_non_function_member_private_extend.carbon:[[@LINE-4]]:34: note: declared here [ClassMemberDeclaration]
+  // CHECK:STDERR:   let derived_static_data: i32 = Derived.static_data;
+  // CHECK:STDERR:                                  ^~~~~~~~~~~~~~~~~~~
+  // CHECK:STDERR:
+  let base_static_data: i32 = Cpp.C.static_data;
+}
+
+// --- todo_fail_import_non_function_member_private_extend_static_within_member_function.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "non_function_member_private.h";
+
+class Derived {
+  extend base: Cpp.C;
+  fn F() {
+    // TODO: `C.static_data` is private, so this should fail.
+    let unqualified_static_data: i32 = static_data;
+  }
 }
 
 // ============================================================================
@@ -156,7 +244,8 @@ fn F(d: Derived) {
 // --- function_member_public.h
 
 struct S {
-  auto foo() -> void;
+  auto instance_fn() -> void;
+  static auto static_fn() -> void;
 };
 
 // --- import_function_member_public.carbon
@@ -167,7 +256,8 @@ import Cpp library "function_member_public.h";
 
 fn F(s: Cpp.S*) {
   //@dump-sem-ir-begin
-  s->foo();
+  s->instance_fn();
+  Cpp.S.static_fn();
   //@dump-sem-ir-end
 }
 
@@ -179,7 +269,8 @@ fn F(s: Cpp.S*) {
 
 class C {
  protected:
-  auto foo() -> void;
+  auto instance_fn() -> void;
+  static auto static_fn() -> void;
 };
 
 // --- fail_import_function_member_protected.carbon
@@ -189,12 +280,55 @@ library "[[@TEST_NAME]]";
 import Cpp library "function_member_protected.h";
 
 fn F(c: Cpp.C*) {
-  // CHECK:STDERR: fail_import_function_member_protected.carbon:[[@LINE+5]]:3: error: cannot access protected member `foo` of type `Cpp.C` [ClassInvalidMemberAccess]
-  // CHECK:STDERR:   c->foo();
-  // CHECK:STDERR:   ^~~~~~
+  // CHECK:STDERR: fail_import_function_member_protected.carbon:[[@LINE+5]]:3: error: cannot access protected member `instance_fn` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   c->instance_fn();
+  // CHECK:STDERR:   ^~~~~~~~~~~~~~
+  // CHECK:STDERR: fail_import_function_member_protected.carbon: note: declared here [ClassMemberDeclaration]
+  // CHECK:STDERR:
+  c->instance_fn();
+  // CHECK:STDERR: fail_import_function_member_protected.carbon:[[@LINE+5]]:3: error: cannot access protected member `static_fn` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   Cpp.C.static_fn();
+  // CHECK:STDERR:   ^~~~~~~~~~~~~~~
   // CHECK:STDERR: fail_import_function_member_protected.carbon: note: declared here [ClassMemberDeclaration]
   // CHECK:STDERR:
-  c->foo();
+  Cpp.C.static_fn();
+}
+
+// --- fail_todo_import_function_member_protected_extend_call_instance_in_member.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "function_member_protected.h";
+
+class Derived {
+  extend base: Cpp.C;
+  fn F[self: Self]() {
+    //@dump-sem-ir-begin
+    // TODO: It should be possible to call protected methods in the base class.
+    // CHECK:STDERR: fail_todo_import_function_member_protected_extend_call_instance_in_member.carbon:[[@LINE+4]]:5: error: call argument of type `Derived` is not supported [CppCallArgTypeNotSupported]
+    // CHECK:STDERR:     self.instance_fn();
+    // CHECK:STDERR:     ^~~~
+    // CHECK:STDERR:
+    self.instance_fn();
+    //@dump-sem-ir-end
+  }
+}
+
+// --- import_function_member_protected_extend_call_static_in_member.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "function_member_protected.h";
+
+class Derived {
+  extend base: Cpp.C;
+  fn F[self: Self]() {
+    //@dump-sem-ir-begin
+    static_fn();
+    Derived.static_fn();
+    Cpp.C.static_fn();
+    //@dump-sem-ir-end
+  }
 }
 
 // ============================================================================
@@ -205,7 +339,8 @@ fn F(c: Cpp.C*) {
 
 class C {
  private:
-  auto foo() -> void;
+  auto instance_fn() -> void;
+  static auto static_fn() -> void;
 };
 
 // --- fail_import_function_member_private.carbon
@@ -214,13 +349,55 @@ library "[[@TEST_NAME]]";
 
 import Cpp library "function_member_private.h";
 
+class Derived {
+  extend base: Cpp.C;
+  fn F[self: Self]() {
+    // CHECK:STDERR: fail_import_function_member_private.carbon:[[@LINE+5]]:5: error: cannot access private member `instance_fn` of type `Cpp.C` [ClassInvalidMemberAccess]
+    // CHECK:STDERR:     self.instance_fn();
+    // CHECK:STDERR:     ^~~~~~~~~~~~~~~~
+    // CHECK:STDERR: fail_import_function_member_private.carbon: note: declared here [ClassMemberDeclaration]
+    // CHECK:STDERR:
+    self.instance_fn();
+    // CHECK:STDERR: fail_import_function_member_private.carbon:[[@LINE+5]]:5: error: cannot access private member `static_fn` of type `Cpp.C` [ClassInvalidMemberAccess]
+    // CHECK:STDERR:     static_fn();
+    // CHECK:STDERR:     ^~~~~~~~~~~
+    // CHECK:STDERR: fail_import_function_member_private.carbon: note: declared here [ClassMemberDeclaration]
+    // CHECK:STDERR:
+    static_fn();
+    // CHECK:STDERR: fail_import_function_member_private.carbon:[[@LINE+5]]:5: error: cannot access private member `static_fn` of type `Cpp.C` [ClassInvalidMemberAccess]
+    // CHECK:STDERR:     Derived.static_fn();
+    // CHECK:STDERR:     ^~~~~~~~~~~~~~~~~
+    // CHECK:STDERR: fail_import_function_member_private.carbon: note: declared here [ClassMemberDeclaration]
+    // CHECK:STDERR:
+    Derived.static_fn();
+    // CHECK:STDERR: fail_import_function_member_private.carbon:[[@LINE+5]]:5: error: cannot access private member `static_fn` of type `Cpp.C` [ClassInvalidMemberAccess]
+    // CHECK:STDERR:     Cpp.C.static_fn();
+    // CHECK:STDERR:     ^~~~~~~~~~~~~~~
+    // CHECK:STDERR: fail_import_function_member_private.carbon: note: declared here [ClassMemberDeclaration]
+    // CHECK:STDERR:
+    Cpp.C.static_fn();
+  }
+}
+
 fn F(c: Cpp.C*) {
-  // CHECK:STDERR: fail_import_function_member_private.carbon:[[@LINE+5]]:3: error: cannot access private member `foo` of type `Cpp.C` [ClassInvalidMemberAccess]
-  // CHECK:STDERR:   c->foo();
-  // CHECK:STDERR:   ^~~~~~
+  // CHECK:STDERR: fail_import_function_member_private.carbon:[[@LINE+5]]:3: error: cannot access private member `instance_fn` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   c->instance_fn();
+  // CHECK:STDERR:   ^~~~~~~~~~~~~~
   // CHECK:STDERR: fail_import_function_member_private.carbon: note: declared here [ClassMemberDeclaration]
   // CHECK:STDERR:
-  c->foo();
+  c->instance_fn();
+  // CHECK:STDERR: fail_import_function_member_private.carbon:[[@LINE+5]]:3: error: cannot access private member `static_fn` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   Derived.static_fn();
+  // CHECK:STDERR:   ^~~~~~~~~~~~~~~~~
+  // CHECK:STDERR: fail_import_function_member_private.carbon: note: declared here [ClassMemberDeclaration]
+  // CHECK:STDERR:
+  Derived.static_fn();
+  // CHECK:STDERR: fail_import_function_member_private.carbon:[[@LINE+5]]:3: error: cannot access private member `static_fn` of type `Cpp.C` [ClassInvalidMemberAccess]
+  // CHECK:STDERR:   Cpp.C.static_fn();
+  // CHECK:STDERR:   ^~~~~~~~~~~~~~~
+  // CHECK:STDERR: fail_import_function_member_private.carbon: note: declared here [ClassMemberDeclaration]
+  // CHECK:STDERR:
+  Cpp.C.static_fn();
 }
 
 // ============================================================================
@@ -434,22 +611,41 @@ fn F() {
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .S = %S.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %S.decl: type = class_decl @S [concrete = constants.%S] {} {}
+// CHECK:STDOUT:   %static_data.var: ref %i32 = var %static_data.var_patt
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%s.param: %S) {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   name_binding_decl {
-// CHECK:STDOUT:     %x.patt: %pattern_type.7ce = binding_pattern x [concrete]
+// CHECK:STDOUT:     %instance_data.patt: %pattern_type.7ce = binding_pattern instance_data [concrete]
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %s.ref: %S = name_ref s, %s
-// CHECK:STDOUT:   %x.ref: %S.elem = name_ref x, @S.%.1 [concrete = @S.%.1]
-// CHECK:STDOUT:   %.loc8_17.1: ref %i32 = class_element_access %s.ref, element0
-// CHECK:STDOUT:   %.loc8_17.2: %i32 = bind_value %.loc8_17.1
-// CHECK:STDOUT:   %.loc8_10: type = splice_block %i32 [concrete = constants.%i32] {
-// CHECK:STDOUT:     %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
-// CHECK:STDOUT:     %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %instance_data.ref: %S.elem = name_ref instance_data, @S.%.1 [concrete = @S.%.1]
+// CHECK:STDOUT:   %.loc8_29.1: ref %i32 = class_element_access %s.ref, element0
+// CHECK:STDOUT:   %.loc8_29.2: %i32 = bind_value %.loc8_29.1
+// CHECK:STDOUT:   %.loc8_22: type = splice_block %i32.loc8 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32.loc8: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32.loc8: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %instance_data: %i32 = bind_name instance_data, %.loc8_29.2
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %static_data.patt: %pattern_type.7ce = binding_pattern static_data [concrete]
 // CHECK:STDOUT:   }
-// CHECK:STDOUT:   %x: %i32 = bind_name x, %.loc8_17.2
+// CHECK:STDOUT:   %Cpp.ref.loc9: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %S.ref.loc9: type = name_ref S, imports.%S.decl [concrete = constants.%S]
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT:   %static_data.ref: ref %i32 = name_ref static_data, imports.%static_data.var
+// CHECK:STDOUT:   %.loc9_20: type = splice_block %i32.loc9 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32.loc9: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32.loc9: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %.loc9_31: %i32 = bind_value %static_data.ref
+// CHECK:STDOUT:   %static_data: %i32 = bind_name static_data, %.loc9_31
 // CHECK:STDOUT:   <elided>
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -465,24 +661,125 @@ fn F() {
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %static_data.var: ref %i32 = var %static_data.var_patt
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%d.param: %Derived) {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   name_binding_decl {
-// CHECK:STDOUT:     %x.patt: %pattern_type.7ce = binding_pattern x [concrete]
+// CHECK:STDOUT:     %instance_data.patt: %pattern_type.7ce = binding_pattern instance_data [concrete]
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %d.ref: %Derived = name_ref d, %d
-// CHECK:STDOUT:   %x.ref: %S.elem = name_ref x, @S.%.1 [concrete = @S.%.1]
-// CHECK:STDOUT:   %.loc12_17.1: ref %S = class_element_access %d.ref, element0
-// CHECK:STDOUT:   %.loc12_17.2: ref %S = converted %d.ref, %.loc12_17.1
-// CHECK:STDOUT:   %.loc12_17.3: ref %i32 = class_element_access %.loc12_17.2, element0
-// CHECK:STDOUT:   %.loc12_10: type = splice_block %i32 [concrete = constants.%i32] {
-// CHECK:STDOUT:     %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
-// CHECK:STDOUT:     %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %instance_data.ref: %S.elem = name_ref instance_data, @S.%.1 [concrete = @S.%.1]
+// CHECK:STDOUT:   %.loc12_29.1: ref %S = class_element_access %d.ref, element0
+// CHECK:STDOUT:   %.loc12_29.2: ref %S = converted %d.ref, %.loc12_29.1
+// CHECK:STDOUT:   %.loc12_29.3: ref %i32 = class_element_access %.loc12_29.2, element0
+// CHECK:STDOUT:   %.loc12_22: type = splice_block %i32.loc12 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32.loc12: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32.loc12: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %.loc12_29.4: %i32 = bind_value %.loc12_29.3
+// CHECK:STDOUT:   %instance_data: %i32 = bind_name instance_data, %.loc12_29.4
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %static_data.patt: %pattern_type.7ce = binding_pattern static_data [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Derived.ref.loc13: type = name_ref Derived, file.%Derived.decl [concrete = constants.%Derived]
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT:   %static_data.ref: ref %i32 = name_ref static_data, imports.%static_data.var
+// CHECK:STDOUT:   %.loc13_20: type = splice_block %i32.loc13 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32.loc13: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32.loc13: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %.loc13_33: %i32 = bind_value %static_data.ref
+// CHECK:STDOUT:   %static_data: %i32 = bind_name static_data, %.loc13_33
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- import_non_function_member_protected_extend_call_in_member.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %Derived: type = class_type @Derived [concrete]
+// CHECK:STDOUT:   %C: type = class_type @C [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %C.elem: type = unbound_element_type %C, %i32 [concrete]
+// CHECK:STDOUT:   %pattern_type.7ce: type = pattern_type %i32 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .C = %C.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
+// CHECK:STDOUT:   %static_data.var: ref %i32 = var %static_data.var_patt
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: class @Derived {
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .Cpp = <poisoned>
+// CHECK:STDOUT:   .base = %.loc7
+// CHECK:STDOUT:   .F = %Derived.F.decl
+// CHECK:STDOUT:   .instance_data = <poisoned>
+// CHECK:STDOUT:   .static_data = <poisoned>
+// CHECK:STDOUT:   .Derived = <poisoned>
+// CHECK:STDOUT:   extend %C.ref
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @Derived.F(%self.param: %Derived) {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %instance_data.patt: %pattern_type.7ce = binding_pattern instance_data [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %self.ref: %Derived = name_ref self, %self
+// CHECK:STDOUT:   %instance_data.ref: %C.elem = name_ref instance_data, @C.%.1 [concrete = @C.%.1]
+// CHECK:STDOUT:   %.loc10_34.1: ref %C = class_element_access %self.ref, element0
+// CHECK:STDOUT:   %.loc10_34.2: ref %C = converted %self.ref, %.loc10_34.1
+// CHECK:STDOUT:   %.loc10_34.3: ref %i32 = class_element_access %.loc10_34.2, element0
+// CHECK:STDOUT:   %.loc10_24: type = splice_block %i32.loc10 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32.loc10: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32.loc10: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %.loc10_34.4: %i32 = bind_value %.loc10_34.3
+// CHECK:STDOUT:   %instance_data: %i32 = bind_name instance_data, %.loc10_34.4
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %unqualified_static_data.patt: %pattern_type.7ce = binding_pattern unqualified_static_data [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT:   %static_data.ref.loc11: ref %i32 = name_ref static_data, imports.%static_data.var
+// CHECK:STDOUT:   %.loc11_34: type = splice_block %i32.loc11 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32.loc11: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32.loc11: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %.loc11_40: %i32 = bind_value %static_data.ref.loc11
+// CHECK:STDOUT:   %unqualified_static_data: %i32 = bind_name unqualified_static_data, %.loc11_40
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %derived_static_data.patt: %pattern_type.7ce = binding_pattern derived_static_data [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Derived.ref: type = name_ref Derived, file.%Derived.decl [concrete = constants.%Derived]
+// CHECK:STDOUT:   %static_data.ref.loc12: ref %i32 = name_ref static_data, imports.%static_data.var
+// CHECK:STDOUT:   %.loc12_30: type = splice_block %i32.loc12 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32.loc12: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32.loc12: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %.loc12_43: %i32 = bind_value %static_data.ref.loc12
+// CHECK:STDOUT:   %derived_static_data: %i32 = bind_name derived_static_data, %.loc12_43
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %base_static_data.patt: %pattern_type.7ce = binding_pattern base_static_data [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %C.ref: type = name_ref C, imports.%C.decl [concrete = constants.%C]
+// CHECK:STDOUT:   %static_data.ref.loc13: ref %i32 = name_ref static_data, imports.%static_data.var
+// CHECK:STDOUT:   %.loc13_27: type = splice_block %i32.loc13 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32.loc13: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32.loc13: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
 // CHECK:STDOUT:   }
-// CHECK:STDOUT:   %.loc12_17.4: %i32 = bind_value %.loc12_17.3
-// CHECK:STDOUT:   %x: %i32 = bind_name x, %.loc12_17.4
+// CHECK:STDOUT:   %.loc13_38: %i32 = bind_value %static_data.ref.loc13
+// CHECK:STDOUT:   %base_static_data: %i32 = bind_name base_static_data, %.loc13_38
 // CHECK:STDOUT:   <elided>
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -492,29 +789,127 @@ fn F() {
 // CHECK:STDOUT:   %S: type = class_type @S [concrete]
 // CHECK:STDOUT:   %ptr.5c7: type = ptr_type %S [concrete]
 // CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
-// CHECK:STDOUT:   %S.foo.cpp_overload_set.type: type = cpp_overload_set_type @S.foo.cpp_overload_set [concrete]
-// CHECK:STDOUT:   %S.foo.cpp_overload_set.value: %S.foo.cpp_overload_set.type = cpp_overload_set_value @S.foo.cpp_overload_set [concrete]
-// CHECK:STDOUT:   %S.foo.type: type = fn_type @S.foo [concrete]
-// CHECK:STDOUT:   %S.foo: %S.foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %S.instance_fn.cpp_overload_set.type: type = cpp_overload_set_type @S.instance_fn.cpp_overload_set [concrete]
+// CHECK:STDOUT:   %S.instance_fn.cpp_overload_set.value: %S.instance_fn.cpp_overload_set.type = cpp_overload_set_value @S.instance_fn.cpp_overload_set [concrete]
+// CHECK:STDOUT:   %S.instance_fn.type: type = fn_type @S.instance_fn [concrete]
+// CHECK:STDOUT:   %S.instance_fn: %S.instance_fn.type = struct_value () [concrete]
+// CHECK:STDOUT:   %S.static_fn.cpp_overload_set.type: type = cpp_overload_set_type @S.static_fn.cpp_overload_set [concrete]
+// CHECK:STDOUT:   %S.static_fn.cpp_overload_set.value: %S.static_fn.cpp_overload_set.type = cpp_overload_set_value @S.static_fn.cpp_overload_set [concrete]
+// CHECK:STDOUT:   %S.static_fn.type: type = fn_type @S.static_fn [concrete]
+// CHECK:STDOUT:   %S.static_fn: %S.static_fn.type = struct_value () [concrete]
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: imports {
-// CHECK:STDOUT:   %S.foo.cpp_overload_set.value: %S.foo.cpp_overload_set.type = cpp_overload_set_value @S.foo.cpp_overload_set [concrete = constants.%S.foo.cpp_overload_set.value]
-// CHECK:STDOUT:   %S.foo.decl: %S.foo.type = fn_decl @S.foo [concrete = constants.%S.foo] {
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .S = %S.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %S.decl: type = class_decl @S [concrete = constants.%S] {} {}
+// CHECK:STDOUT:   %S.instance_fn.cpp_overload_set.value: %S.instance_fn.cpp_overload_set.type = cpp_overload_set_value @S.instance_fn.cpp_overload_set [concrete = constants.%S.instance_fn.cpp_overload_set.value]
+// CHECK:STDOUT:   %S.instance_fn.decl: %S.instance_fn.type = fn_decl @S.instance_fn [concrete = constants.%S.instance_fn] {
 // CHECK:STDOUT:     <elided>
 // CHECK:STDOUT:   } {
 // CHECK:STDOUT:     <elided>
 // CHECK:STDOUT:   }
+// CHECK:STDOUT:   %S.static_fn.cpp_overload_set.value: %S.static_fn.cpp_overload_set.type = cpp_overload_set_value @S.static_fn.cpp_overload_set [concrete = constants.%S.static_fn.cpp_overload_set.value]
+// CHECK:STDOUT:   %S.static_fn.decl: %S.static_fn.type = fn_decl @S.static_fn [concrete = constants.%S.static_fn] {} {}
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F(%s.param: %ptr.5c7) {
 // CHECK:STDOUT: !entry:
 // CHECK:STDOUT:   %s.ref: %ptr.5c7 = name_ref s, %s
 // CHECK:STDOUT:   %.loc8: ref %S = deref %s.ref
-// CHECK:STDOUT:   %foo.ref: %S.foo.cpp_overload_set.type = name_ref foo, imports.%S.foo.cpp_overload_set.value [concrete = constants.%S.foo.cpp_overload_set.value]
-// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %.loc8, %foo.ref
+// CHECK:STDOUT:   %instance_fn.ref: %S.instance_fn.cpp_overload_set.type = name_ref instance_fn, imports.%S.instance_fn.cpp_overload_set.value [concrete = constants.%S.instance_fn.cpp_overload_set.value]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %.loc8, %instance_fn.ref
 // CHECK:STDOUT:   %addr: %ptr.5c7 = addr_of %.loc8
-// CHECK:STDOUT:   %S.foo.call: init %empty_tuple.type = call imports.%S.foo.decl(%addr)
+// CHECK:STDOUT:   %S.instance_fn.call: init %empty_tuple.type = call imports.%S.instance_fn.decl(%addr)
+// CHECK:STDOUT:   %Cpp.ref.loc9: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %S.ref.loc9: type = name_ref S, imports.%S.decl [concrete = constants.%S]
+// CHECK:STDOUT:   %static_fn.ref: %S.static_fn.cpp_overload_set.type = name_ref static_fn, imports.%S.static_fn.cpp_overload_set.value [concrete = constants.%S.static_fn.cpp_overload_set.value]
+// CHECK:STDOUT:   %S.static_fn.call: init %empty_tuple.type = call imports.%S.static_fn.decl()
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_todo_import_function_member_protected_extend_call_instance_in_member.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %Derived: type = class_type @Derived [concrete]
+// CHECK:STDOUT:   %C.instance_fn.cpp_overload_set.type: type = cpp_overload_set_type @C.instance_fn.cpp_overload_set [concrete]
+// CHECK:STDOUT:   %C.instance_fn.cpp_overload_set.value: %C.instance_fn.cpp_overload_set.type = cpp_overload_set_value @C.instance_fn.cpp_overload_set [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %C.instance_fn.cpp_overload_set.value: %C.instance_fn.cpp_overload_set.type = cpp_overload_set_value @C.instance_fn.cpp_overload_set [concrete = constants.%C.instance_fn.cpp_overload_set.value]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: class @Derived {
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .Cpp = <poisoned>
+// CHECK:STDOUT:   .base = %.loc7
+// CHECK:STDOUT:   .F = %Derived.F.decl
+// CHECK:STDOUT:   .instance_fn = <poisoned>
+// CHECK:STDOUT:   extend %C.ref
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @Derived.F(%self.param: %Derived) {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %self.ref: %Derived = name_ref self, %self
+// CHECK:STDOUT:   %instance_fn.ref: %C.instance_fn.cpp_overload_set.type = name_ref instance_fn, imports.%C.instance_fn.cpp_overload_set.value [concrete = constants.%C.instance_fn.cpp_overload_set.value]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %self.ref, %instance_fn.ref
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- import_function_member_protected_extend_call_static_in_member.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %Derived: type = class_type @Derived [concrete]
+// CHECK:STDOUT:   %C: type = class_type @C [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %C.static_fn.cpp_overload_set.type: type = cpp_overload_set_type @C.static_fn.cpp_overload_set [concrete]
+// CHECK:STDOUT:   %C.static_fn.cpp_overload_set.value: %C.static_fn.cpp_overload_set.type = cpp_overload_set_value @C.static_fn.cpp_overload_set [concrete]
+// CHECK:STDOUT:   %C.static_fn.type: type = fn_type @C.static_fn [concrete]
+// CHECK:STDOUT:   %C.static_fn: %C.static_fn.type = struct_value () [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .C = %C.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
+// CHECK:STDOUT:   %C.static_fn.cpp_overload_set.value: %C.static_fn.cpp_overload_set.type = cpp_overload_set_value @C.static_fn.cpp_overload_set [concrete = constants.%C.static_fn.cpp_overload_set.value]
+// CHECK:STDOUT:   %C.static_fn.decl: %C.static_fn.type = fn_decl @C.static_fn [concrete = constants.%C.static_fn] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: class @Derived {
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT:   complete_type_witness = %complete_type
+// CHECK:STDOUT:
+// CHECK:STDOUT: !members:
+// CHECK:STDOUT:   .Self = constants.%Derived
+// CHECK:STDOUT:   .Cpp = <poisoned>
+// CHECK:STDOUT:   .base = %.loc7
+// CHECK:STDOUT:   .F = %Derived.F.decl
+// CHECK:STDOUT:   .static_fn = <poisoned>
+// CHECK:STDOUT:   .Derived = <poisoned>
+// CHECK:STDOUT:   extend %C.ref
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @Derived.F(%self.param: %Derived) {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %static_fn.ref.loc10: %C.static_fn.cpp_overload_set.type = name_ref static_fn, imports.%C.static_fn.cpp_overload_set.value [concrete = constants.%C.static_fn.cpp_overload_set.value]
+// CHECK:STDOUT:   %C.static_fn.call.loc10: init %empty_tuple.type = call imports.%C.static_fn.decl()
+// CHECK:STDOUT:   %Derived.ref: type = name_ref Derived, file.%Derived.decl [concrete = constants.%Derived]
+// CHECK:STDOUT:   %static_fn.ref.loc11: %C.static_fn.cpp_overload_set.type = name_ref static_fn, imports.%C.static_fn.cpp_overload_set.value [concrete = constants.%C.static_fn.cpp_overload_set.value]
+// CHECK:STDOUT:   %C.static_fn.call.loc11: init %empty_tuple.type = call imports.%C.static_fn.decl()
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %C.ref: type = name_ref C, imports.%C.decl [concrete = constants.%C]
+// CHECK:STDOUT:   %static_fn.ref.loc12: %C.static_fn.cpp_overload_set.type = name_ref static_fn, imports.%C.static_fn.cpp_overload_set.value [concrete = constants.%C.static_fn.cpp_overload_set.value]
+// CHECK:STDOUT:   %C.static_fn.call.loc12: init %empty_tuple.type = call imports.%C.static_fn.decl()
 // CHECK:STDOUT:   <elided>
 // CHECK:STDOUT: }
 // CHECK:STDOUT: