clang/test/CodeCompletion/desig-init.cpp

struct Base {
  int t;
};
struct Foo : public Base {
  int x;
  Base b;
  void foo();
};

void foo() {
  Foo F{.x = 2, .b.t = 0};
  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:11:10 %s -o - -std=c++2a | FileCheck -check-prefix=CHECK-CC1 %s
  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:11:18 %s -o - -std=c++2a | FileCheck -check-prefix=CHECK-CC1 %s
  // CHECK-CC1: COMPLETION: b : [#Base#]b
  // CHECK-CC1-NEXT: COMPLETION: x : [#int#]x
  // CHECK-CC1-NOT: foo
  // CHECK-CC1-NOT: t

  // FIXME: Handle nested designators
  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:11:20 %s -o - | count 0

  Base B = {.t = 2};
  auto z = [](Base B) {};
  z({.t = 1});
  z(Base{.t = 2});
  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:22:14 %s -o - -std=c++2a | FileCheck -check-prefix=CHECK-CC2 %s
  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:24:7 %s -o - -std=c++2a | FileCheck -check-prefix=CHECK-CC2 %s
  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:25:11 %s -o - -std=c++2a | FileCheck -check-prefix=CHECK-CC2 %s
  // CHECK-CC2: COMPLETION: t : [#int#]t
}

// Handle templates
template <typename T>
struct Test { T x; };
template <>
struct Test<int> {
  int x;
  char y;
};
void bar() {
  Test<char> T{.x = 2};
  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:41:17 %s -o - -std=c++2a | FileCheck -check-prefix=CHECK-CC3 %s
  // CHECK-CC3: COMPLETION: x : [#T#]x
  Test<int> X{.x = 2};
  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:44:16 %s -o - -std=c++2a | FileCheck -check-prefix=CHECK-CC4 %s
  // CHECK-CC4: COMPLETION: x : [#int#]x
  // CHECK-CC4-NEXT: COMPLETION: y : [#char#]y
}

template <typename T>
void aux() {
  Test<T> X{.x = T(2)};
  // RUN: %clang_cc1 -fsyntax-only -code-completion-patterns -code-completion-at=%s:52:14 %s -o - -std=c++2a | FileCheck -check-prefix=CHECK-CC3 %s
}