YouCompleteMe/cpp/llvm/tools/clang/test/SemaCXX/format-strings-0x.cpp

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// RUN: %clang_cc1 -fsyntax-only -verify -pedantic -std=c++11 %s
extern "C" {
extern int scanf(const char *restrict, ...);
extern int printf(const char *restrict, ...);
}
void f(char **sp, float *fp) {
scanf("%as", sp); // expected-warning{{format specifies type 'float *' but the argument has type 'char **'}}
printf("%a", 1.0);
scanf("%afoobar", fp);
printf(nullptr);
printf(*sp); // expected-warning {{not a string literal}}
}