llvm-project/clang/test/Preprocessor/_Pragma-in-macro-arg.cpp

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C++

// RUN: %clang_cc1 %s -verify -Wconversion
#define P(X) _Pragma(#X)
#define V(X) X
#define X \
P(clang diagnostic push) \
P(clang diagnostic ignored "-Wconversion") \
) = 1.2; \
P(clang diagnostic pop)
void f() {
int a = 1.2; // expected-warning {{changes value}}
// Note, we intentionally enter a tentatively-parsed context here to trigger
// regular use of lookahead. This would go wrong if _Pragma checking in macro
// argument pre-expansion also tries to use token lookahead.
int (b
V(X)
int c = 1.2; // expected-warning {{changes value}}
}