gcc/testsuite/gcc.dg/c11-keywords-1.c

/* Test new C23 keywords not keywords in C11.  */
/* { dg-do compile } */
/* { dg-options "-std=c11 -pedantic-errors" } */

int alignas;
int alignof;
int bool;
int constexpr;
int false;
int true;
int static_assert;
int thread_local;