[Bug c++/83287] New: ice in tsubst_copy, at cp/pt.c:14884

["dcb314 at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83287

            Bug ID: 83287
           Summary: ice in tsubst_copy, at cp/pt.c:14884
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 42793
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42793&action=edit
gzipped C++ source code

The attached C++ source code, with recent gcc trunk, does this:

In file included from array_real.cpp:28:
array_tlp.hpp: In instantiation of ‘void ArrayOperatorF() [with K = double; KK
=
 double]’:
array_real.cpp:45:35:   required from here
array_tlp.hpp:1760:27: internal compiler error: in tsubst_copy, at
cp/pt.c:14884
0x7e5bf2 tsubst_copy
        ../../trunk/gcc/cp/pt.c:14884
0x7cc740 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bo
ol)
        ../../trunk/gcc/cp/pt.c:18294
0x7cf287 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bo
ol)
        ../../trunk/gcc/cp/pt.c:17929
0x7cc588 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bo
ol)
        ../../trunk/gcc/cp/pt.c:17438
0x7cd121 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bo
ol)

This bug seems to have been around since before revision 248835.

Here is a reduced piece of code which seems to demonstrate the problem:

void a();
namespace {
void a();
}
template <class, class> b() { a }
void c {
  b<double, double>()
}