[Bug c++/94478] New: [10 Regression] ICE in comptypes, at cp/typeck.c:1486

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94478

            Bug ID: 94478
           Summary: [10 Regression] ICE in comptypes, at cp/typeck.c:1486
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

g++-10.0.1-alpha20200329 snapshot (g:60c254b279e8e8443b8ad26cc46b9e4084cff66c)
ICEs when compiling the following testcase, extracted from
test/CXX/class/class.compare/class.compare.default/p1.cpp from the clang 10.0.0
test suite, w/ -std=c++2a:

struct B {};
bool operator==(const B&, const B&) = default;

% g++-10.0.1 -std=c++2a -c kknpryrr.cpp
kknpryrr.cpp:2:39: internal compiler error: in comptypes, at cp/typeck.c:1486
    2 | bool operator==(const B&, const B&) = default;
      |                                       ^~~~~~~
0x68caf4 comptypes(tree_node*, tree_node*, int)
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200329/work/gcc-10-20200329/gcc/cp/typeck.c:1486
0x965416 early_check_defaulted_comparison
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200329/work/gcc-10-20200329/gcc/cp/method.c:1133
0x965416 defaultable_fn_check(tree_node*)
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200329/work/gcc-10-20200329/gcc/cp/method.c:2997
0x90e088 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200329/work/gcc-10-20200329/gcc/cp/decl.c:7554
0x9b878b cp_parser_init_declarator
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200329/work/gcc-10-20200329/gcc/cp/parser.c:20909
0x998b56 cp_parser_simple_declaration
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200329/work/gcc-10-20200329/gcc/cp/parser.c:13731
0x9c3302 cp_parser_declaration
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200329/work/gcc-10-20200329/gcc/cp/parser.c:13430
0x9c3a9f cp_parser_translation_unit
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200329/work/gcc-10-20200329/gcc/cp/parser.c:4731
0x9c3a9f c_parse_file()
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200329/work/gcc-10-20200329/gcc/cp/parser.c:43944
0xadbadb c_common_parse_file()
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200329/work/gcc-10-20200329/gcc/c-family/c-opts.c:1186