[Bug c/101171] [12 Regression] ICE: tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in c_expr_sizeof_expr, at c/c-typeck.c:3006

[anbu1024.me at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101171

--- Comment #3 from John X <anbu1024.me at gmail dot com> ---
(In reply to Richard Biener from comment #1)
> Is your GCC 11 compiler checking-enabled?  I doubt it is a regression.

gcc 11 build command:
```
configure --prefix=install_path --enable-languages=c --disable-multilib
```

Platform: Ubuntu 20.04 x64