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From: "StevenSun2021 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/101717] [12 Regression] ICE capturing static member within
 stateless generic lambda
Date: Tue, 03 Aug 2021 22:23:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101717

Steven Sun <StevenSun2021 at hotmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |StevenSun2021 at hotmail d=
ot com

--- Comment #3 from Steven Sun <StevenSun2021 at hotmail dot com> ---
This bug is not introduced in GCC 12.

The relevant code fragment is last edited by g:91e534b0d


in `gcc/cp/lambda.c`
```
gcc_checking_assert
(init && (TREE_TYPE (TREE_TYPE (init))
=3D=3D current_nonlambda_class_type ()));

```

The assertion fails since long ago. (init =3D=3D 0 in this case)

Before GCC 12, the `gcc_checking_assert` is `(void)0` in release version,
leaving everything fine. Somehow `gcc_checking_assert` starts working now, =
and
aborts the program.


My insight on the problem:
The program seems never think of a situation "a lambda inside a lambda insi=
de a
NSDMI`. We need to amend the logic here.

"here" means
https://gcc.gnu.org/git?p=3Dgcc.git;a=3Dblob;f=3Dgcc/cp/lambda.c;h=3D2e9d38=
bbe832702804ddcaffc4024ce930a74843;hb=3Drefs/heads/master#l755

By the way, does anyone know other magics like g:hash?=