https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83714

            Bug ID: 83714
           Summary: [8 Regression] ICE in build_address, at
                    cp/typeck.c:5733
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jason at gcc dot gnu.org
  Target Milestone: ---

Starting from r218879 we ICE on:

$ cat hell2.ii
class a {
  typedef int b;
  operator b();
};
struct c {
  using d = a;
};
using e = c;
auto f(auto) -> e {
  return e::d {};
};

$ g++ hell2.ii 
hell2.ii: In function ‘e f(auto:1)’:
hell2.ii:10:16: internal compiler error: in build_address, at cp/typeck.c:5733
   return e::d {};
                ^
0x85b2e1 build_address(tree_node*)
        ../../gcc/cp/typeck.c:5733
0x62d460 add_function_candidate
        ../../gcc/cp/call.c:2158
0x62ed6f add_candidates
        ../../gcc/cp/call.c:5516
0x629e63 add_candidates
        ../../gcc/cp/call.c:3840
0x629e63 build_user_type_conversion_1
        ../../gcc/cp/call.c:3841
0x62b854 implicit_conversion
        ../../gcc/cp/call.c:1889
0x627253 perform_implicit_conversion_flags(tree_node*, tree_node*, int, int)
        ../../gcc/cp/call.c:10516
0x874f21 check_return_expr(tree_node*, bool*)
        ../../gcc/cp/typeck.c:9346
0x81a4ae finish_return_stmt(tree_node*)
        ../../gcc/cp/semantics.c:890
0x76c7ac cp_parser_jump_statement
        ../../gcc/cp/parser.c:12335
0x76c7ac cp_parser_statement
        ../../gcc/cp/parser.c:10752
0x76d0c0 cp_parser_statement_seq_opt
        ../../gcc/cp/parser.c:11185
0x76d197 cp_parser_compound_statement
        ../../gcc/cp/parser.c:11139
0x785d20 cp_parser_function_body
        ../../gcc/cp/parser.c:21679
0x785d20 cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc/cp/parser.c:21716
0x7864b0 cp_parser_function_definition_after_declarator
        ../../gcc/cp/parser.c:26620
0x78717d cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc/cp/parser.c:26536
0x78717d cp_parser_init_declarator
        ../../gcc/cp/parser.c:19405
0x78f4ac cp_parser_simple_declaration
        ../../gcc/cp/parser.c:12968
0x7903f8 cp_parser_block_declaration
        ../../gcc/cp/parser.c:12793

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