llvm-project/clang/test/Analysis/enum.cpp

// RUN: %clang_cc1 -analyze -std=c++11 -analyzer-checker=debug.ExprInspection %s

void clang_analyzer_eval(bool);

enum class Foo {
  Zero
};

bool pr15703(int x) {
  return Foo::Zero == (Foo)x; // don't crash
}

void testCasting(int i) {
  Foo f = static_cast<Foo>(i);
  int j = static_cast<int>(f);
  if (i == 0)
  {
    clang_analyzer_eval(f == Foo::Zero); // expected-warning{{TRUE}}
    clang_analyzer_eval(j == 0); // expected-warning{{TRUE}}
  }
  else
  {
    clang_analyzer_eval(f == Foo::Zero); // expected-warning{{FALSE}}
    clang_analyzer_eval(j == 0); // expected-warning{{FALSE}}
  }
}