[Bug libstdc++/94869] [10 Regression] Template argument deduction/substitution failure with Howard Hinnant's calendar library

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94869

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
   Last reconfirmed|                            |2020-04-30
   Target Milestone|---                         |10.0
            Summary|Template argument           |[10 Regression] Template
                   |deduction/substitution      |argument
                   |failure with Howard         |deduction/substitution
                   |Hinnant's calendar library  |failure with Howard
                   |                            |Hinnant's calendar library
          Component|c++                         |libstdc++
             Status|UNCONFIRMED                 |WAITING
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you provide a complete testcase?  I'm sure date.h does not include
any STL bits.  That is, please provide preprocessed source.