hanchenye-llvm-project/clang/test/CXX/lex/lex.literal/lex.ext/p1.cpp

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// RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
int * operator "" p31(long double); // expected-warning{{user-defined literal with suffix 'p31' is preempted by C99 hexfloat extension}}
long double operator "" _p31(long double);
long double operator "" pi(long double); // expected-warning{{user-defined literals not starting with '_' are reserved by the implementation}}
float hexfloat = 0x1p31; // allow hexfloats