[Bug c++/78648] New: ICE on invalid C++ code on x86_64-linux-gnu (Segmentation fault, contains_struct_check)

[chengniansun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78648

            Bug ID: 78648
           Summary: ICE on invalid C++ code on x86_64-linux-gnu
                    (Segmentation fault, contains_struct_check)
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com
  Target Milestone: ---

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20161202 (experimental) [trunk revision 243153] (GCC) 
$ 
$ gcc-trunk small.C
small.C: In function ‘void bar()’:
small.C:4:14: error: invalid use of cv-qualified type ‘const void’ in parameter
declaration
   e([](const void) {});
              ^~~~
small.C: In instantiation of ‘void e(F) [with F = bar() [with int <anonymous> =
1]::<lambda>]’:
small.C:1:28: internal compiler error: Segmentation fault
 template <typename F> void e(F) {}
                            ^
0xdf7cff crash_signal
        ../../gcc-source-trunk/gcc/toplev.c:333
0x8787d3 contains_struct_check
        ../../gcc-source-trunk/gcc/tree.h:3159
0x8787d3 write_closure_type_name
        ../../gcc-source-trunk/gcc/cp/mangle.c:1641
0x8787d3 write_unqualified_name
        ../../gcc-source-trunk/gcc/cp/mangle.c:1385
0x87e667 write_name
        ../../gcc-source-trunk/gcc/cp/mangle.c:939
0x87e528 write_local_name
        ../../gcc-source-trunk/gcc/cp/mangle.c:2027
0x87e528 write_name
        ../../gcc-source-trunk/gcc/cp/mangle.c:966
0x87f091 write_class_enum_type
        ../../gcc-source-trunk/gcc/cp/mangle.c:2769
0x87f091 write_type
        ../../gcc-source-trunk/gcc/cp/mangle.c:2187
0x87e0fc write_template_args
        ../../gcc-source-trunk/gcc/cp/mangle.c:2798
0x87e433 write_name
        ../../gcc-source-trunk/gcc/cp/mangle.c:935
0x883658 write_encoding
        ../../gcc-source-trunk/gcc/cp/mangle.c:823
0x88568c mangle_decl_string
        ../../gcc-source-trunk/gcc/cp/mangle.c:3743
0x8857d8 get_mangled_id
        ../../gcc-source-trunk/gcc/cp/mangle.c:3765
0x885a80 mangle_decl(tree_node*)
        ../../gcc-source-trunk/gcc/cp/mangle.c:3835
0x10a2490 decl_assembler_name(tree_node*)
        ../../gcc-source-trunk/gcc/tree.c:671
0x9f1231 symtab_node::get_comdat_group_id()
        ../../gcc-source-trunk/gcc/cgraph.h:210
0x9f1231 analyze_functions
        ../../gcc-source-trunk/gcc/cgraphunit.c:1037
0x9f29f8 symbol_table::finalize_compilation_unit()
        ../../gcc-source-trunk/gcc/cgraphunit.c:2562
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.
$ 
$ cat small.C
template <typename F> void e(F) {}

template <int> void bar() {
  e([](const void) {});
}

void baz() { bar<1>; }
$