void foo() {
// expected-error@+1 2 {{use of undeclared identifier 'a'}}
a = 2; a = 2; b = 2; b = 2; c = 2;
// expected-error@+1 2 {{asdf}}
d = 2;
e = 2; f = 2; // expected-error 2 {{use of undeclared identifier 'e'}}
}