[Bug c++/99071] New: [modules] ICE with initializer_list & iostream

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99071

            Bug ID: 99071
           Summary: [modules] ICE with initializer_list & iostream
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nathan at gcc dot gnu.org
  Target Milestone: ---

build initializer_list as a header unit, then attempt to build iostream as one:

obj/x86_64/gcc/xg++ -Bobj/x86_64/gcc/ -nostdinc++
-Iobj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-Iobj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include
-Isrc/libstdc++-v3/libsupc++ -Isrc/libstdc++-v3/include/backward  -std=c++17  
-x c++-system-header -fmodules-ts initializer_list -c
devvm1702:100>obj/x86_64/gcc/xg++ -Bobj/x86_64/gcc/ -nostdinc++
-Iobj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-Iobj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include
-Isrc/libstdc++-v3/libsupc++ -Isrc/libstdc++-v3/include/backward  -std=c++17  
-x c++-system-header -fmodules-ts iostream -c
In file included from
obj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include/string:54,
                 from
obj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/locale_classes.h:40,
                 from
obj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/ios_base.h:41,
                 from
obj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include/ios:42,
                 from
obj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include/ostream:38,
                 from
obj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include/iostream:39:
obj/x86_64/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/range_access.h:50:34:
internal compiler error: tree check: expected binding_vector, have overload in
maybe_record_mergeable_decl, at cp/name-lookup.c:3562
   50 |     begin(_Container& __cont) -> decltype(__cont.begin())
      |                                  ^~~~~~~~~~~~~~~~~~~~~~~~
0x1d18ce2 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        ../../../src/gcc/tree.c:9814
0xad1a11 tree_check(tree_node*, char const*, int, char const*, tree_code)
        ../../../src/gcc/tree.h:3349
0xd394c6 maybe_record_mergeable_decl
        ../../../src/gcc/cp/name-lookup.c:3562
0xd3aa63 do_pushdecl
        ../../../src/gcc/cp/name-lookup.c:3870
0xd3e485 do_pushdecl_with_scope
        ../../../src/gcc/cp/name-lookup.c:4894
0xd43815 pushdecl_namespace_level(tree_node*, bool)
        ../../../src/gcc/cp/name-lookup.c:6259
0xde89fe push_template_decl(tree_node*, bool)
        ../../../src/gcc/cp/pt.c:6054
0xc14f7c start_preparsed_function(tree_node*, tree_node*, int)
        ../../../src/gcc/cp/decl.c:16472
0xc17d7e start_function(cp_decl_specifier_seq*, cp_declarator const*,
tree_node*)
        ../../../src/gcc/cp/decl.c:16809
0xd9239f cp_parser_function_definition_from_specifiers_and_declarator
        ../../../src/gcc/cp/parser.c:29817
0xd817a2 cp_parser_init_declarator
        ../../../src/gcc/cp/parser.c:21564
0xd93cc2 cp_parser_single_declaration
        ../../../src/gcc/cp/parser.c:30441
0xd92947 cp_parser_template_declaration_after_parameters
        ../../../src/gcc/cp/parser.c:30013
0xd938bb cp_parser_explicit_template_declaration
        ../../../src/gcc/cp/parser.c:30279
0xd93915 cp_parser_template_declaration_after_export
        ../../../src/gcc/cp/parser.c:30298
0xd77a93 cp_parser_template_declaration
        ../../../src/gcc/cp/parser.c:16533
0xd73361 cp_parser_declaration
        ../../../src/gcc/cp/parser.c:14009
0xd73774 cp_parser_toplevel_declaration
        ../../../src/gcc/cp/parser.c:14107
0xd72f15 cp_parser_declaration_seq_opt
        ../../../src/gcc/cp/parser.c:13895
0xd7edf3 cp_parser_namespace_body
        ../../../src/gcc/cp/parser.c:20395
Please submit a full bug report,