[Bug c++/61670] ICE on invalid in tree_nop_conversion

["dimhen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61670

--- Comment #5 from Dmitry G. Dyachenko <dimhen at gmail dot com> ---
r218716 FAIL for me

Fedora 21 x86_64

PR61670]$ LANG=C /usr/local/gcc_current/bin/g++ -fsyntax-only -fpreprocessed
au.ii 
au.ii:3:3: error: expected ';' at end of member declaration
   0
   ^
au.ii: In instantiation of 'class A<int>':
au.ii:6:8:   required from here
au.ii:3:3: error: 'A< <template-parameter-1-1> >::<anonymous>' has incomplete
type
au.ii:1:24: note: definition of 'class A<int>' is not complete until the
closing brace
 template <class> class A {
                        ^
au.ii:1:24: internal compiler error: Segmentation fault
0xcad88f crash_signal
    /home/dimhen/src/gcc_current/gcc/toplev.c:358
0xf18a01 tree_nop_conversion
    /home/dimhen/src/gcc_current/gcc/tree.c:11711
0xf18a01 tree_strip_nop_conversions(tree_node*)
    /home/dimhen/src/gcc_current/gcc/tree.c:11750
0xf1a2aa integer_zerop(tree_node const*)
    /home/dimhen/src/gcc_current/gcc/tree.c:2176
0x6cebcf remove_zero_width_bit_fields
    /home/dimhen/src/gcc_current/gcc/cp/class.c:5313
0x6cebcf layout_class_type
    /home/dimhen/src/gcc_current/gcc/cp/class.c:6251
0x6db15c finish_struct_1(tree_node*)
    /home/dimhen/src/gcc_current/gcc/cp/class.c:6473
0x6adeaa instantiate_class_template_1
    /home/dimhen/src/gcc_current/gcc/cp/pt.c:9592
0x6adeaa instantiate_class_template(tree_node*)
    /home/dimhen/src/gcc_current/gcc/cp/pt.c:9632
0x74474b complete_type(tree_node*)
    /home/dimhen/src/gcc_current/gcc/cp/typeck.c:136
0x620927 start_decl_1(tree_node*, bool)
    /home/dimhen/src/gcc_current/gcc/cp/decl.c:4862
0x643427 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
    /home/dimhen/src/gcc_current/gcc/cp/decl.c:4825
0x72ca9a cp_parser_init_declarator
    /home/dimhen/src/gcc_current/gcc/cp/parser.c:17082
0x72e4c6 cp_parser_simple_declaration
    /home/dimhen/src/gcc_current/gcc/cp/parser.c:11548
0x72e873 cp_parser_block_declaration
    /home/dimhen/src/gcc_current/gcc/cp/parser.c:11429
0x70fb59 cp_parser_declaration
    /home/dimhen/src/gcc_current/gcc/cp/parser.c:11326
0x73c0fa cp_parser_declaration_seq_opt
    /home/dimhen/src/gcc_current/gcc/cp/parser.c:11212
0x73c437 cp_parser_translation_unit
    /home/dimhen/src/gcc_current/gcc/cp/parser.c:4102
0x73c437 c_parse_file()
    /home/dimhen/src/gcc_current/gcc/cp/parser.c:32222
0x86ed62 c_common_parse_file()
    /home/dimhen/src/gcc_current/gcc/c-family/c-opts.c:1039
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.

$ LANG=C /usr/local/gcc_current/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/usr/local/gcc_current/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/gcc_current/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/dimhen/src/gcc_current/configure
--prefix=/usr/local/gcc_current/ --enable-languages=c,c++,lto
--enable-plugin=yes --enable-static
Thread model: posix
gcc version 5.0.0 20141214 (experimental) [trunk revision 218716] (GCC)