https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94691

            Bug ID: 94691
           Summary: ICE resolving deduction guide
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nathan at gcc dot gnu.org
  Target Milestone: ---

Created attachment 48324
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48324&action=edit
testcase

This ICEs.  Removing 'const' makes it work.  

devvm2772:52>./cc1plus -std=c++20 jc.ii
 void f()
jc.ii:14:10: internal compiler error: in alias_ctad_tweaks, at cp/pt.c:28472
   14 |   X1 x1{ };
      |          ^
0xcd5728 alias_ctad_tweaks
        ../../../src/gcc/cp/pt.c:28472
0xcd6438 deduction_guides_for
        ../../../src/gcc/cp/pt.c:28644

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