Comment 1:

Here's a simpler program producing a similar (the same?) internal error:
package p
type T interface {
    m() [T(nil).m()[0]]int
}
$ gccgo x.go
go1: internal compiler error: in insert, at go/gofrontend/gogo.cc:5946
0x55fccc Statement_inserter::insert(Statement*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/gogo.cc:5946
0x5294d3 Interface_field_reference_expression::do_lower(Gogo*, Named_object*,
Statement_inserter*, int)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/expressions.cc:11568
0x555a6e Expression::lower(Gogo*, Named_object*, Statement_inserter*, int)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/expressions.h:574
0x555a6e Lower_parse_tree::expression(Expression**)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/gogo.cc:1712
0x555a6e Lower_parse_tree::expression(Expression**)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/gogo.cc:1700
0x5268f5 Expression::traverse(Expression**, Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/expressions.cc:52
0x530c2c Call_expression::do_traverse(Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/expressions.cc:9177
0x555a29 Lower_parse_tree::expression(Expression**)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/gogo.cc:1705
0x5268f5 Expression::traverse(Expression**, Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/expressions.cc:52
0x526b23 Index_expression::do_traverse(Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/expressions.cc:10240
0x555a29 Lower_parse_tree::expression(Expression**)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/gogo.cc:1705
0x5268f5 Expression::traverse(Expression**, Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/expressions.cc:52
0x5992ea Array_type::do_traverse(Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/types.cc:5379
0x5992ea Array_type::do_traverse(Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/types.cc:5374
0x599234 Type::traverse(Type*, Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/types.cc:300
0x59f005 Typed_identifier_list::traverse(Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/types.cc:9920
0x59f0bc Function_type::do_traverse(Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/types.cc:3150
0x59f0bc Function_type::do_traverse(Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/types.cc:3141
0x599234 Type::traverse(Type*, Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/types.cc:300
0x59f005 Typed_identifier_list::traverse(Traverse*)
    /tmp/go-build-release/gccgo-srcdir/gcc/go/gofrontend/types.cc:9920
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://go.ext.google.com/go/>; for instructions.
Interestingly, a useful error message appears if an unused import is added:
$ cat x.go
package p
import "math"
type T interface {
    m() [T(nil).m()[0]]int
}
$ gccgo x.go
x.go:3:12: error: imported and not used: math
 import "math"
            ^
x.go:6:20: error: array bound is not constant
     m() [T(nil).m()[0]]int
                    ^

Comment 2:

Labels changed: added go1.3maybe.

Comment 3:

Labels changed: added release-none, removed go1.3maybe.

Comment 4:

Labels changed: added repo-gccgo.

Comment 6:

For this issue, I'd also like to note that the struct parallel crashes as well:
$ cat x.go
package p
type T struct {
    m [T{}.m[0]]int
}
$ gccgo x.go
x.go:3:6: error: invalid recursive type ‘T’
 type T struct {
      ^
gccgo: internal compiler error: Segmentation fault (program go1)
0x406008 execute
    ../../gcc/gcc/gcc.c:2912
0x40a915 do_spec_1
    ../../gcc/gcc/gcc.c:4841
0x40de65 process_brace_body
    ../../gcc/gcc/gcc.c:6124
0x40dc94 handle_braces
    ../../gcc/gcc/gcc.c:6038
0x40c90b do_spec_1
    ../../gcc/gcc/gcc.c:5495
0x40de65 process_brace_body
    ../../gcc/gcc/gcc.c:6124
0x40dc94 handle_braces
    ../../gcc/gcc/gcc.c:6038
0x40c90b do_spec_1
    ../../gcc/gcc/gcc.c:5495
0x40ccf9 do_spec_1
    ../../gcc/gcc/gcc.c:5610
0x40de65 process_brace_body
    ../../gcc/gcc/gcc.c:6124
0x40dc94 handle_braces
    ../../gcc/gcc/gcc.c:6038
0x40c90b do_spec_1
    ../../gcc/gcc/gcc.c:5495
0x409f80 do_spec_2
    ../../gcc/gcc/gcc.c:4542
0x409e9e do_spec(char const*)
    ../../gcc/gcc/gcc.c:4509
0x4120d1 driver::do_spec_on_infiles() const
    ../../gcc/gcc/gcc.c:7678
0x40fa85 driver::main(int, char**)
    ../../gcc/gcc/gcc.c:6915
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.

Labels changed: removed priority-triage, gccgo, release-none.

Owner changed to @paranoiacblack.

Status changed to Started.

This was fixed in https://code.google.com/p/gofrontend/source/detail?r=2a85649c19e1.