[Bug c++/68936] New: [6 Regression] ICE: tree check: expected call_expr, have target_expr in build_min_non_dep_call_vec, at cp/tree.c:2744

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68936

            Bug ID: 68936
           Summary: [6 Regression] ICE: tree check: expected call_expr,
                    have target_expr in build_min_non_dep_call_vec, at
                    cp/tree.c:2744
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
  Target Milestone: ---

A very recent regression:

trippels@gcc2-power8 status % cat testwave_dll.ii
class A {};
struct predefined_macros {
  struct B {
    A (predefined_macros::*generator)();
  };
};
template <typename> class C {
  void m_fn1();
  predefined_macros predef;
};
template <typename ContextT> void C<ContextT>::m_fn1() {
predefined_macros::B m = (predef.*m.generator)();
}


trippels@gcc2-power8 status % g++ -c testwave_dll.ii
testwave_dll.ii: In member function ‘void C< <template-parameter-1-1>
>::m_fn1()’:
testwave_dll.ii:12:48: internal compiler error: tree check: expected call_expr,
have target_expr in build_min_non_dep_call_vec, at cp/tree.c:2744
 predefined_macros::B m = (predef.*m.generator)();
                                                ^

0x10d8c8f3 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        ../../gcc/gcc/tree.c:9606
0x103c4bcb tree_check
        ../../gcc/gcc/tree.h:2997
0x103c4bcb build_min_non_dep_call_vec(tree_node*, tree_node*, vec<tree_node*,
va_gc, vl_embed>*)
        ../../gcc/gcc/cp/tree.c:2744
0x102a18d3 build_offset_ref_call_from_tree(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ../../gcc/gcc/cp/decl2.c:5001
0x102e5e3f cp_parser_postfix_expression
        ../../gcc/gcc/cp/parser.c:6812
0x102f2663 cp_parser_unary_expression
        ../../gcc/gcc/cp/parser.c:7901
0x102f36e3 cp_parser_cast_expression
        ../../gcc/gcc/cp/parser.c:8578
0x102f3ddb cp_parser_binary_expression
        ../../gcc/gcc/cp/parser.c:8680
0x102f4a5f cp_parser_assignment_expression
        ../../gcc/gcc/cp/parser.c:8968
0x102f5257 cp_parser_constant_expression
        ../../gcc/gcc/cp/parser.c:9236
0x102f5f17 cp_parser_initializer_clause
        ../../gcc/gcc/cp/parser.c:20681
0x102f8817 cp_parser_initializer
        ../../gcc/gcc/cp/parser.c:20622
0x1030fdab cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:18494
0x1031054f cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:12278
0x10310c47 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:12147
0x103120df cp_parser_declaration_statement
        ../../gcc/gcc/cp/parser.c:11759
0x102e0b57 cp_parser_statement
        ../../gcc/gcc/cp/parser.c:10441
0x102e1597 cp_parser_statement_seq_opt
        ../../gcc/gcc/cp/parser.c:10719
0x102e176f cp_parser_compound_statement
        ../../gcc/gcc/cp/parser.c:10673
0x1030dfab cp_parser_function_body
        ../../gcc/gcc/cp/parser.c:20541