llvm-project/clang/test/Lexer/utf8-invalid.c

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// RUN: %clang_cc1 -fsyntax-only -verify %s
// RUN: %clang_cc1 -E %s -o /dev/null
// Note: This file deliberately contains invalid UTF-8. Please do not fix!
extern int x; // expected-error{{source file is not valid UTF-8}}
#if 0
// Don't warn about bad UTF-8 in raw lexing mode.
extern int x;
#endif
// Don't warn about bad UTF-8 in preprocessor directives.
#define x82
#pragma mark