[Bug c++/67762] [C++1z] 'not a constant expression" errors only with -fsanitize=undefined

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67762

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-09-29
     Ever confirmed|0                           |1

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.  I'll reduce this to something more usable.

Note that I get ICE with gcc-5:

In file included from /var/tmp/cmcstl2/include/stl2/type_traits.hpp:16:0,
                 from /var/tmp/cmcstl2/test/variant.cpp:15:
/var/tmp/cmcstl2/include/stl2/detail/fwd.hpp:47:5: error: ‘requires’ does not
name a type
In file included from /var/tmp/cmcstl2/include/stl2/type_traits.hpp:18:0,
                 from /var/tmp/cmcstl2/test/variant.cpp:15:
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:24:3: error: ‘concept’
does not name a type
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:27:3: error: ‘concept’
does not name a type
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:30:3: error: ‘concept’
does not name a type
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:33:3: error: ‘concept’
does not name a type
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:42:5: error: ‘concept’
does not name a type
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:55:32: error:
‘std::experimental::ranges_v1::detail::_Same’ has not been declared
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:55:37: error: expected
‘>’ before ‘<’ token
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:56:28: error: ‘Rest’ was
not declared in this scope
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:56:32: error: expected
parameter pack before ‘...’
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:56:20: error: template
argument 2 is invalid
/var/tmp/cmcstl2/include/stl2/detail/concepts/core.hpp:56:20: internal compiler
error: tree check: expected tree_vec, have error_mark in
get_innermost_template_args, at cp/pt.c:595
0xf2bdac tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        /home/marek/src/gcc/gcc/tree.c:9297
0x652619 tree_check(tree_node*, char const*, int, char const*, tree_code)
        /home/marek/src/gcc/gcc/tree.h:2851
0x652619 get_innermost_template_args(tree_node*, int)
        /home/marek/src/gcc/gcc/cp/pt.c:595
0x6a23e3 process_partial_specialization
        /home/marek/src/gcc/gcc/cp/pt.c:4148
0x6a4467 push_template_decl_real(tree_node*, bool)
        /home/marek/src/gcc/gcc/cp/pt.c:4907
0x640104 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
        /home/marek/src/gcc/gcc/cp/decl.c:4839
0x735afd cp_parser_init_declarator
        /home/marek/src/gcc/gcc/cp/parser.c:17195
0x736702 cp_parser_single_declaration
        /home/marek/src/gcc/gcc/cp/parser.c:23850
0x7369b8 cp_parser_template_declaration_after_export
        /home/marek/src/gcc/gcc/cp/parser.c:23641
0x73bf19 cp_parser_declaration
        /home/marek/src/gcc/gcc/cp/parser.c:11343
0x73a41a cp_parser_declaration_seq_opt
        /home/marek/src/gcc/gcc/cp/parser.c:11265
0x73ac95 cp_parser_namespace_body
        /home/marek/src/gcc/gcc/cp/parser.c:16293
0x73ac95 cp_parser_namespace_definition
        /home/marek/src/gcc/gcc/cp/parser.c:16274
0x73be79 cp_parser_declaration
        /home/marek/src/gcc/gcc/cp/parser.c:11367
0x73a41a cp_parser_declaration_seq_opt
        /home/marek/src/gcc/gcc/cp/parser.c:11265
0x73ac95 cp_parser_namespace_body
        /home/marek/src/gcc/gcc/cp/parser.c:16293
0x73ac95 cp_parser_namespace_definition
        /home/marek/src/gcc/gcc/cp/parser.c:16274
0x73be79 cp_parser_declaration
        /home/marek/src/gcc/gcc/cp/parser.c:11367
0x73a41a cp_parser_declaration_seq_opt
        /home/marek/src/gcc/gcc/cp/parser.c:11265
0x73ac95 cp_parser_namespace_body
        /home/marek/src/gcc/gcc/cp/parser.c:16293
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