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From: "fiesh at zefix dot tv" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99640] New: Internal compiler error: in
 lookup_template_class_1, at cp/pt.c:9895
Date: Thu, 18 Mar 2021 07:15:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99640

            Bug ID: 99640
           Summary: Internal compiler error: in lookup_template_class_1,
                    at cp/pt.c:9895
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fiesh at zefix dot tv
  Target Milestone: ---

The following reduced code results in the internal compiler error mentioned=
 in
the subject line:

---------------

class QVariantOutputArchive {
public:
  QVariantOutputArchive(int);
  template <typename...> void operator()() {
    {
      {
        {
          {
            {
              {
                {
                  {
                    {
                      {
                        {
                          {
                            {
                              {
                                [](auto) { operator(); };
                              }
                            }
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
};
template <typename, int> void qVariantArchiveTestVersioned() {
  int variant;
  QVariantOutputArchive oar(variant);
  oar();
}
void qVariantArchiveTest() { qVariantArchiveTestVersioned<int, true>; }


---------------

% c++ -c -std=3Dc++17 zomg.ii
zomg.ii: In instantiation of =E2=80=98void QVariantOutputArchive::operator(=
)() [with
<template-parameter-1-1> =3D {}]=E2=80=99:
zomg.ii:39:6:   required from =E2=80=98void qVariantArchiveTestVersioned() =
[with
<template-parameter-1-1> =3D int; int <anonymous> =3D 1]=E2=80=99
zomg.ii:41:69:   required from here
zomg.ii:19:44: internal compiler error: in lookup_template_class_1, at
cp/pt.c:9895
   19 |                                 [](auto) { operator(); };
      |                                            ^~~~~~~~~~
0x5c3a44 lookup_template_class_1=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:9895
0x7399a5 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_nod=
e*,
int, int)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:10118
0x7399a5 tsubst_aggr_type
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:13400
0x734326 tsubst(tree_node*, tree_node*, int, tree_node*)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:15181
0x73114c tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, boo=
l,
bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:19302
0x730bcc tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, boo=
l,
bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:19160
0x730bcc tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, boo=
l,
bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:19281
0x731904 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, boo=
l,
bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:20211
0x72a405 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, boo=
l,
bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:19160
0x72a405 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:18773
0x72bdb1 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:17840
0x72bdb1 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)=20=20=
=20=20
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:17885
0x72aeb8 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:17840
0x72aeb8 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:18174
0x72aeb8 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:17840=
=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x72aeb8 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)=20=20=
=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
/usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:18174=20=20=
=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                                                0x72ff96
tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
/usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:17840=20=20=
=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                                                0x72ff96
tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)=20=20=20=20=20=
=20=20=20=20=20
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:19113
0x7327c9 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, boo=
l,
bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:20508
0x72a405 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, boo=
l,
bool)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:19160
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.=20
See <https://bugs.gentoo.org/> for instructions.=