[Bug c++/125537] [contracts] g++-16 crashes on contracts pre and post with auto parameters

"zheng.xianyuwang at gmail dot com via Gcc-bugs" <[email protected]>
Newsgroups gmane.comp.gcc.bugs
Message-ID <[email protected]/bugzilla/> 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125537

--- Comment #1 from Wang Jinghao <zheng.xianyuwang at gmail dot com> ---
This is caused by temporarily enabling `processing_template_decl' in
`tsubst_contract' when the return type is `auto', causing the type-conversion
`IMPLICIT_CONV_EXPR' to be left until the genericization stage. Narrowing the
conditions under which `processing_template_decl' is enabled fixes the issue.
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