llvm-project/clang/test/Sema/anonymous-struct-union-c11.c

// Check for warnings in non-C11 mode:
// RUN: %clang_cc1 -fsyntax-only -std=c99 -verify -Wc11-extensions %s

// Expect no warnings in C11 mode:
// RUN: %clang_cc1 -fsyntax-only -std=c11 -pedantic -Werror %s

struct s {
  int a;
  struct { // expected-warning{{anonymous structs are a C11 extension}}
    int b;
  };
};

struct t {
  int a;
  union { // expected-warning{{anonymous unions are a C11 extension}}
    int b;
  };
};