[cfe-commits] [patch][pr11550] Extend the unused variable warning

[Rafael Ávila de Espíndola]

The attached patch extends clang's warning for unused variables to cover
cases where the variable type has a constructor, but it is not used. For
example:

struct S {
  S();
};
S foo();
void bar() {
  S x = foo(); // expected-warning {{unused variable 'x'}}
}

I have tested the patch in clang itself and I am now testing it on
firefox. Is the patch OK if there are no false positives in the firefox
build?

Cheers,
Rafael
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