1*ab2436eeSRichard Smith #pragma GCC system_header 2*ab2436eeSRichard Smith #pragma once 3*ab2436eeSRichard Smith f()4*ab2436eeSRichard Smith inline void f() { register int k; } 5*ab2436eeSRichard Smith #define to_int(x) ({ register int n = (x); n; }) 6