[Bug c++/95888] Regression in 9.3. GCC freezes when compiling code using boost::poly_collection::segment

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95888

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |10.1.0, 9.3.0
            Version|unknown                     |9.3.0
           Keywords|                            |compile-time-hog
      Known to work|                            |9.2.0
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The problem started with r10-7007-6b3302da9ef26aa11940f8c0dc92bec19e15c09b:

            PR c++/90505 - mismatch in template argument deduction.
            * pt.c (tsubst): Don't reduce the template level of template
            parameters when tf_partial.