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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103328] [11/12 Regression] ICE in remap_gimple_stmt, at
 tree-inline.c:1921 since r11-7419-g0f161cc8494cf728
Date: Fri, 19 Nov 2021 13:42:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103328

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note the BLOCK is lost somewhere between CFG build (still OK as by
verify_gimple_in_cfg) and free_lang_data where it is lost.

Oh, so the BLOCK in question is used in two different functions BIND_EXPRs
and thus during the lowering of another function the BLOCK tree of the first
function referencing the BLOCK is garbled.

(gdb) p cfun->decl->decl_common.initial=20
$18 =3D <block 0x7ffff6478300>
(gdb) p cfun->decl->decl_common.initial->block.supercontext=20
$19 =3D <block 0x7ffff6478360>
(gdb) p cfun->decl->decl_common.initial->block.supercontext->block.supercon=
text
$20 =3D <block 0x7ffff6478600>
(gdb) p
cfun->decl->decl_common.initial->block.supercontext->block.supercontext->bl=
ock.supercontext->block.supercontext
$21 =3D <function_decl 0x7ffff6483d00 operator()>

  gcc_assert (BLOCK_SUPERCONTEXT (DECL_INITIAL (current_function_decl))
              =3D=3D current_function_decl);

at the start of lower_function_body will trip on this.  So somewhere corout=
ines
functions are constructed we fail to copy the BLOCK tree of shared parts.=