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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99844] New: ICE: unexpected expression 'B' of kind
 template_parm_index
Date: Wed, 31 Mar 2021 02:58:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99844

            Bug ID: 99844
           Summary: ICE: unexpected expression 'B' of kind
                    template_parm_index
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

Related to fixed PR 99745 and PR 99757.

https://godbolt.org/z/5qW5a1Mnq

template <bool... B>
struct S {
  constexpr explicit(B) S() {}
};

constexpr S<true> s;


<source>:3:25: internal compiler error: unexpected expression 'B' of kind
template_parm_index
    3 |   constexpr explicit(B) S() {}
      |                         ^
0x1cfb6a9 internal_error(char const*, ...)
        ???:0
0x9164c7 tsubst(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x959fc9 instantiate_class_template(tree_node*)
        ???:0
0x77fbc7 start_decl_1(tree_node*, bool)
        ???:0
0x7a728f start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
        ???:0
0x8e12ad c_parse_file()
        ???:0
0xa600a2 c_common_parse_file()
        ???:0
Please submit a full bug report,
with preprocessed source if appropriate.=