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From: "dje at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96008] cpp1y/lambda-generic-69078-1.C nonnull warning and ICE
Date: Tue, 30 Jun 2020 17:59:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96008

--- Comment #3 from David Edelsohn <dje at gcc dot gnu.org> ---
msebor:
the warning is working correctly but the IL the C++ front end
emits doesn't look right: AFAICS, it creates a function object
for the lambda and calls its operator() with a null this pointer:

; Function static decltype (((const main()::<lambda(auto:1
...)>*)0)->operator()<auto:1
...>(static_cast<auto:1&&>(main::._anon_0::_FUN::<unnamed>) ...))
main()::<lambda(auto:1 ...)>::_FUN(auto:1 ...) [with auto:1 =3D {int};
decltype (((const main()::<lambda(auto:1 ...)>*)0)->operator()<auto:1
...>(static_cast<auto:1&&>(main::._anon_0::_FUN::<unnamed>) ...)) =3D
void] (null)
;; enabled by -tree-original


<<cleanup_point <<< Unknown tree: expr_stmt
   main()::<lambda(auto:1 ...)>::operator()<int> (0B, D.2440) >>>>>;
return;


The ICE is PR95984=