[Bug c++/65201] range-for range-init containing variable named like for-range-declaration iterates over uninitialized for-range-declaration

["maltsevm at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65201

Mikhail Maltsev <maltsevm at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |maltsevm at gmail dot com

--- Comment #2 from Mikhail Maltsev <maltsevm at gmail dot com> ---
Reduced testcase, miscompilation, works on clang 3.5.0, but causes segfault on
trunk (r221132) and on g++ 4.8.2 20140120, x86_64-unknown-linux-gnu:

$ cat ./range-for30_r2.cc
struct str
{
    str () : v(0) {}
    str (const str &s) : v(s.v) {}
    ~str () { v = 0; }
    int v;
};

str data[1];

struct vec
{
    str *begin () { return data; }
    str *end () { return data + 1; }
};

vec split (str &s)
{
    s = str();
    return vec();
}

int main ()
{
    str foo;
    for (str &foo : split(foo))
        foo = str();
    return foo.v;
}

And here is an even more minimized testcase (technically it's a different kind
of bug, "accepts invalid") - but I suppose that these bugs are related.

$ cat ./range-for30_r.cc
struct str { };
struct vec {
  str *begin () {}
  str *end () {}
};
vec split (str) {}
int main () {
  for (str foo : split(foo))
    ;
}

Clang rejects this with the following error:
./range-for30_r.cc:8:24: error: use of undeclared identifier 'foo'; did you
mean 'for'?
  for (str foo : split(foo))