[Bug c++/64297] New: [5 Regression] ICE: canonical types differ for identical types

[reichelt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64297

            Bug ID: 64297
           Summary: [5 Regression] ICE: canonical types differ for
                    identical types
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org

The followiong valid testcase triggers an ICE on trunk:

=================================================
#include <functional>

struct A
{
  typedef bool X;
  template<int> X foo() const;
};

std::function<bool(const A*)> b(&A::foo<0>);
=================================================

bug.cc:9:43: internal compiler error: canonical types differ for identical
types bool() const and A::X() const {aka bool() const}
 std::function<bool(const A*)> b(&A::foo<0>);
                                           ^
0x74279e comptypes(tree_node*, tree_node*, int)
        ../../gcc/gcc/cp/typeck.c:1419
0x6b4c31 resolve_address_of_overloaded_function
        ../../gcc/gcc/cp/class.c:7490
0x5fc3a6 standard_conversion
        ../../gcc/gcc/cp/call.c:1124
0x609528 implicit_conversion
        ../../gcc/gcc/cp/call.c:1785
0x60ada2 add_function_candidate
        ../../gcc/gcc/cp/call.c:2092
0x60bb88 add_template_candidate_real
        ../../gcc/gcc/cp/call.c:3090
0x60c27c add_template_candidate
        ../../gcc/gcc/cp/call.c:3132
0x60c27c add_candidates
        ../../gcc/gcc/cp/call.c:5263
0x608351 build_user_type_conversion_1
        ../../gcc/gcc/cp/call.c:3640
0x60982f implicit_conversion
        ../../gcc/gcc/cp/call.c:1844
0x6090e5 reference_binding
        ../../gcc/gcc/cp/call.c:1704
0x609544 implicit_conversion
        ../../gcc/gcc/cp/call.c:1783
0x60ada2 add_function_candidate
        ../../gcc/gcc/cp/call.c:2092
0x60c2c7 add_candidates
        ../../gcc/gcc/cp/call.c:5273
0x601d70 build_new_method_call_1
        ../../gcc/gcc/cp/call.c:8021
0x601d70 build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
        ../../gcc/gcc/cp/call.c:8217
0x603389 build_special_member_call(tree_node*, tree_node*, vec<tree_node*,
va_gc, vl_embed>**, tree_node*, int, int)
        ../../gcc/gcc/cp/call.c:7761
0x76c059 expand_default_init
        ../../gcc/gcc/cp/init.c:1720
0x76c059 expand_aggr_init_1
        ../../gcc/gcc/cp/init.c:1821
0x76cd14 build_aggr_init(tree_node*, tree_node*, int, int)
        ../../gcc/gcc/cp/init.c:1573
Please submit a full bug report, [etc.]

The regression was introduced between 2014-10-24 and 2014-11-14.