[Bug c++/79325] New: ICE on valid C++ code on x86_64-linux-gnu: in arg_assoc_type, at cp/name-lookup.c:5823

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79325

            Bug ID: 79325
           Summary: ICE on valid C++ code on x86_64-linux-gnu: in
                    arg_assoc_type, at cp/name-lookup.c:5823
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

It seems to affect 4.8.x and later, but not 4.7.x. 

It might be related to PR 71820. 


$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.1 20170201 (experimental) [trunk revision 245079] (GCC)
$
$ g++-4.7 -c small.cpp
$ clang++ -c small.cpp
$
$ g++-trunk -c small.cpp
small.cpp:3:27: internal compiler error: in arg_assoc_type, at
cp/name-lookup.c:5823
 __typeof__ (f (foo < int >)) bar;
                           ^
0x89be72 arg_assoc_type
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:5823
0x89be06 arg_assoc_args
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:5834
0x89be06 arg_assoc_type
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:5806
0x89b66d arg_assoc
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:5905
0x89b838 arg_assoc
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:5893
0x89e931 arg_assoc_args_vec
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:5849
0x89e931 lookup_arg_dependent_1
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:5954
0x89e931 lookup_arg_dependent(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>*)
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:5982
0x838e24 perform_koenig_lookup(cp_expr, vec<tree_node*, va_gc, vl_embed>*, int)
        ../../gcc-source-trunk/gcc/cp/semantics.c:2252
0x7b3e95 cp_parser_postfix_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:6916
0x7ae4bc cp_parser_unary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8098
0x7bb717 cp_parser_cast_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8775
0x7bbd25 cp_parser_binary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8877
0x7bc610 cp_parser_assignment_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9165
0x7bf0d9 cp_parser_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9332
0x7b17d9 cp_parser_primary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:4923
0x7b323e cp_parser_postfix_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:6779
0x7ae4bc cp_parser_unary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8098
0x7aed6c cp_parser_sizeof_operand
        ../../gcc-source-trunk/gcc/cp/parser.c:27439
0x7af219 cp_parser_simple_type_specifier
        ../../gcc-source-trunk/gcc/cp/parser.c:16707
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$


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int f (void (*) (int, int));
template < typename T > void foo (T t, __typeof__ (t));
__typeof__ (f (foo < int >)) bar;