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From: "haoxintu at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95807] GCC accepts "void value not ignored as it ought to
 be" in function template
Date: Mon, 22 Jun 2020 03:48:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95807

--- Comment #2 from Haoxin Tu <haoxintu at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> I think it is rejected at instanition time.

Hi, Andrew. Shouldn't it be rejected at compiling time?

Please take a look at another case, test.cc

$cat test.cc
void foo1(int var =3D throw) {};
template <class>=20
void foo2(int var =3D throw){ };

$g++ -c test.cc
test.cc:1:21: error: could not convert =E2=80=98<throw-expression>=E2=80=99=
 from =E2=80=98void=E2=80=99 to
=E2=80=98int=E2=80=99
    1 | void foo1(int var =3D throw){ };
      |                     ^~~~~
      |                     |
      |                     void


$clang++ -c test.c
test.cc:1:15: error: cannot initialize a parameter of type 'int' with an rv=
alue
of type 'void'
void foo1(int var =3D throw){ };
              ^     ~~~~~
test.cc:1:15: note: passing argument to parameter 'var' here
test.cc:3:15: error: cannot initialize a parameter of type 'int' with an rv=
alue
of type 'void'
void foo2(int var =3D throw){ };
              ^     ~~~~~
test.cc:3:15: note: passing argument to parameter 'var' here
2 errors generated.

Is this case similar with bug.cc?
I guess an "void" can't be a rvalue at any time.=