clang-tools-extra/test/clang-tidy/checkers/bugprone-reserved-identifier-c.c

// RUN: %check_clang_tidy %s bugprone-reserved-identifier %t

// in C, double underscores are fine except at the beginning

void foo__();
void f__o__o();
void f_________oo();
void __foo();
// CHECK-MESSAGES: :[[@LINE-1]]:6: warning: declaration uses identifier '__foo', which is a reserved identifier [bugprone-reserved-identifier]
// CHECK-FIXES: {{^}}void foo();{{$}}