[Bug c++/71570] New: ICE on invalid C++11 code (with invalid variable capture) on x86_64-linux-gnu: in cxx_incomplete_type_diagnostic, at cp/typeck2.c:551

["su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71570

            Bug ID: 71570
           Summary: ICE on invalid C++11 code (with invalid variable
                    capture) on x86_64-linux-gnu: in
                    cxx_incomplete_type_diagnostic, at cp/typeck2.c:551
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

The following C++11 code causes an ICE when compiled with the current GCC trunk
on x86_64-linux-gnu in both 32-bit and 64-bit modes.  

It also affects 6.1.x and is a regression from 5.4.x. 


$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-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 20160617 (experimental) [trunk revision 237557] (GCC) 
$ 
$ g++-trunk -c small.cpp
small.cpp: In function âvoid foo()â:
small.cpp:5:5: error: cannot capture âfooâ by reference
   [&foo]
     ^~~
small.cpp: In lambda function:
small.cpp:7:11: internal compiler error: in cxx_incomplete_type_diagnostic, at
cp/typeck2.c:551
     foo (0);
           ^
0x727e2d cxx_incomplete_type_diagnostic(unsigned int, tree_node const*,
tree_node const*, diagnostic_t)
        ../../gcc-source-trunk/gcc/cp/typeck2.c:551
0x7bffd5 cxx_incomplete_type_diagnostic
        ../../gcc-source-trunk/gcc/cp/cp-tree.h:6757
0x7bffd5 complete_type_or_maybe_complain(tree_node*, tree_node*, int)
        ../../gcc-source-trunk/gcc/cp/typeck.c:152
0x7cde76 decay_conversion(tree_node*, int, bool)
        ../../gcc-source-trunk/gcc/cp/typeck.c:2044
0x661e52 build_addr_func(tree_node*, int)
        ../../gcc-source-trunk/gcc/cp/call.c:282
0x7d0f6e cp_build_function_call_vec(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ../../gcc-source-trunk/gcc/cp/typeck.c:3583
0x817680 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
        ../../gcc-source-trunk/gcc/cp/semantics.c:2454
0x78ee50 cp_parser_postfix_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:6904
0x78d4ac cp_parser_unary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:7986
0x797327 cp_parser_cast_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8663
0x797925 cp_parser_binary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8765
0x798210 cp_parser_assignment_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9053
0x79ab09 cp_parser_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9220
0x79b12f cp_parser_expression_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:10681
0x7a9f6b cp_parser_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:10532
0x7aac2c cp_parser_statement_seq_opt
        ../../gcc-source-trunk/gcc/cp/parser.c:10804
0x7b03be cp_parser_lambda_body
        ../../gcc-source-trunk/gcc/cp/parser.c:10270
0x7b03be cp_parser_lambda_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9754
0x7848dc cp_parser_primary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:4934
0x78f076 cp_parser_postfix_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:6691
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.
$ 


-------------------------


void foo (int);

void foo (void)
{
  [&foo]
  {
    foo (0); 
  };
}