[Bug c++/27572] New: [4.0/4.1/4.2 regression] ICE on typedef in parameter declaration

["reichelt at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The C++ frontend currently chokes on invalid typedefs in parameter
declarations for both functions and templates.
One can generate ICEs in many different places like the following
examples show:

======================================
void foo(typedef) {}
======================================

bug.cc:1: error: ISO C++ forbids declaration of 'parameter' with no type
bug.cc:1: error: typedef declaration invalid in parameter declaration
bug.cc: In function 'void foo(int)':
bug.cc:1: internal compiler error: tree check: expected tree that contains
'decl with RTL' structure, have 'type_decl'  in set_decl_rtl, at emit-rtl.c:949
Please submit a full bug report, [etc.]

======================================
void foo(typedef x[]) {}
======================================

ICE in pop_binding, at cp/name-lookup.c:380

======================================
template<typedef> void foo();

void bar()
{
  foo<int>();
}
======================================

ICE in instantiate_decl, at cp/pt.c:11703

======================================
template<typedef,int> struct A;
======================================

tree check ICE: expected template_type_parm or template_template_parm or
bound_template_template_parm, have integer_type in process_template_parm, at
cp/pt.c:2336

======================================
template<typedef> struct A
{
  void foo();
  void bar();
};

A<int> a;
======================================

ICE in finish_member_declaration, at cp/semantics.c:2212

======================================
template<typedef> struct A
{
  friend void foo();
};

A<int> a;
======================================

ICE in tsubst_decl, at cp/pt.c:6263

Some of these examples crash since GCC 2.95.3, but some (like the first
and last) since 3.4.0, so this is a regression.

Patch to follow.


-- 
           Summary: [4.0/4.1/4.2 regression] ICE on typedef in parameter
                    declaration
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, error-recovery, monitored
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27572