http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53143

--- Comment #1 from John David Anglin <danglin at gcc dot gnu.org> 2012-04-27 
19:06:48 UTC ---
Seems to be caused by the following decl:

Breakpoint 1, c_tree_printer (pp=0x80000001002055b8, text=0x800003fffdff1208,
    spec=0x80000001001c0dc9 "T", precision=0, wide=0 '\000',
    set_locus=0 '\000', hash=0 '\000') at ../../gcc/gcc/c-objc-common.c:136
136           gcc_assert (TYPE_P (t));
(gdb) p debug_tree (t)
 <field_decl 800003fffdeb1098 b
    type <integer_type 800003fffddd75e8 int public SI
        size <integer_cst 800003fffddd08e0 constant 32>
        unit size <integer_cst 800003fffddd0900 constant 4>
        align 32 symtab 0 alias set -1 canonical type 800003fffddd75e8
precision 32 min <integer_cst 800003fffddd0880 -2147483648> max <integer_cst
800003fffddd08a0 2147483647>
        pointer_to_this <pointer_type 800003fffdde42a0>>
    SI file /test/gnu/gcc/gcc/gcc/testsuite/gcc.dg/20011021-1.c line 11 col 7
size <integer_cst 800003fffddd08e0 32> unit size <integer_cst 800003fffddd0900
4>
    align 32 offset_align 128
    offset <integer_cst 800003fffddd05a0 type <integer_type 800003fffddd7000
sizetype> constant 0> bit offset <integer_cst 800003fffddd08e0 32> context
<record_type 800003fffdea29d8 t> chain <field_decl 800003fffdeb1130 c>>

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