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[Bug c++/81997] New: segfault while instantiating constrained function template


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81997

            Bug ID: 81997
           Summary: segfault while instantiating constrained function
                    template
           Product: gcc
           Version: 7.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gccbugzilla at szaszm dot tk
  Target Milestone: ---

Created attachment 42051
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42051&action=edit
Preprocessed source file

gcc-7.2.0 segfaults when trying to compile the following c++ code using
concepts.
It works without any problems when removing concepts-related code.

cli log: https://pastebin.com/TDSwN6k2
source file: https://pastebin.com/ncq0CHV1

Steps to reproduce:
- try to compile the attached source file with g++-7.2.0

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