llvm-project/clang/test/Lexer/wchar.c

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// RUN: %clang_cc1 -fsyntax-only -fshort-wchar -verify %s
void f() {
(void)L"\U00010000"; // expected-warning {{character unicode escape sequence too long for its type}}
(void)L'\U00010000'; // expected-warning {{character unicode escape sequence too long for its type}}
(void)L'ab'; // expected-warning {{extraneous characters in wide character constant ignored}}
(void)L'a\u1000'; // expected-warning {{extraneous characters in wide character constant ignored}}
}