[Bug c++/92551] accepts invalid code in function template

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92551

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2019-11-18
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Darrell Wright from comment #0)
> I accidently produced this invalid code and it worked as intended until I
> tested further.  However, the integer_sequence should never have been deduced
> https://gcc.godbolt.org/z/hp4crn
> 
> This will return 20, but should be an error 

Why? It looks deducable to me.