[Bug c++/86200] New: [8/9 Regression] ICE in dependent_type_p, at cp/pt.c:24634

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86200

            Bug ID: 86200
           Summary: [8/9 Regression] ICE in dependent_type_p, at
                    cp/pt.c:24634
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Changed between 20180211 and 20180218.
Derived from g++.dg/cpp0x/lambda/lambda-variadic1.C :


$ cat z1.cc
template<typename ... Args>
static void foo()
{
  [](Args, int x) {
    x;
  };
}
int main()
{
  foo();
}


$ gcc-9-20180617 -c z1.cc
z1.cc: In instantiation of 'void foo() [with Args = {}]':
z1.cc:10:7:   required from here
z1.cc:4:3: internal compiler error: in dependent_type_p, at cp/pt.c:24634
   [](Args, int x) {
   ^
0x7163e0 dependent_type_p(tree_node*)
        ../../gcc/cp/pt.c:24634
0x67bff8 require_complete_types_for_parms
        ../../gcc/cp/decl.c:12556
0x67bff8 check_function_type
        ../../gcc/cp/decl.c:14722
0x67bff8 start_preparsed_function(tree_node*, tree_node*, int)
        ../../gcc/cp/decl.c:14936
0x6b2df4 start_lambda_function(tree_node*, tree_node*)
        ../../gcc/cp/lambda.c:1420
0x71a577 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
        ../../gcc/cp/pt.c:17620
0x71b748 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
        ../../gcc/cp/pt.c:18928
0x720357 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        ../../gcc/cp/pt.c:17396
0x71ede5 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        ../../gcc/cp/pt.c:16597
0x7201ec tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        ../../gcc/cp/pt.c:16583
0x72005d tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        ../../gcc/cp/pt.c:16880
0x71e961 instantiate_decl(tree_node*, bool, bool)
        ../../gcc/cp/pt.c:24027
0x739e0b instantiate_pending_templates(int)
        ../../gcc/cp/pt.c:24141
0x698f23 c_parse_final_cleanups()
        ../../gcc/cp/decl2.c:4707