[Bug c++/103518] New: g++ hangs on invalid code

[egor.pugin at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103518

            Bug ID: 103518
           Summary: g++ hangs on invalid code
           Product: gcc
           Version: 11.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: egor.pugin at gmail dot com
  Target Milestone: ---

Preprocessed file (315KB):
https://www.dropbox.com/s/tey8z9mfi123uon/gcc_hang.tar.xz?dl=1

Command:
g++ -std=c++2b -c 1.cpp

Replace line 114821 from (invalid)
        title_link title_{.title_{""}, .link{""}};
to (valid)
        title_link title_{.title_{""}, .link_{""}};
and build completes within 5-6 s.