[Bug c++/77549] New: ICE on invalid C++ code that references undeclared variable

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77549

            Bug ID: 77549
           Summary: ICE on invalid C++ code that references undeclared
                    variable
           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: ---

This is a regression from 6.2.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 20160909 (experimental) [trunk revision 240043] (GCC)
$
$ g++-6.2 -c small.cpp
small.cpp: In function ‘void f()’:
small.cpp:9:3: error: ‘x’ was not declared in this scope
   x;
   ^
$
$ g++-trunk -c small.cpp
small.cpp: In function ‘void f()’:
small.cpp:9:3: error: ‘x’ was not declared in this scope
   x;
   ^
small.cpp:9:3: internal compiler error: tree check: expected tree that contains
‘decl minimal’ structure, have ‘tree_list’ in consider_binding_level, at
cp/name-lookup.c:4721
0x1087684 tree_contains_struct_check_failed(tree_node const*,
tree_node_structure_enum, char const*, int, char const*)
        ../../gcc-source-trunk/gcc/tree.c:9914
0x877ccc contains_struct_check
        ../../gcc-source-trunk/gcc/tree.h:3140
0x877ccc consider_binding_level
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:4721
0x87daba lookup_name_fuzzy(tree_node*, lookup_name_fuzzy_kind)
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:4742
0x880fac suggest_alternatives_for(unsigned int, tree_node*)
        ../../gcc-source-trunk/gcc/cp/name-lookup.c:4445
0x7841b8 unqualified_name_lookup_error(tree_node*, unsigned int)
        ../../gcc-source-trunk/gcc/cp/lex.c:461
0x79b2f1 cp_parser_postfix_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:6742
0x799bac cp_parser_unary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8019
0x7a3a57 cp_parser_cast_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8696
0x7a4055 cp_parser_binary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8798
0x7a4940 cp_parser_assignment_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9086
0x7a7239 cp_parser_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9253
0x7a785f cp_parser_expression_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:10736
0x7b619c cp_parser_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:10587
0x7b711c cp_parser_statement_seq_opt
        ../../gcc-source-trunk/gcc/cp/parser.c:10859
0x7b720f cp_parser_compound_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:10813
0x7b73bf cp_parser_function_body
        ../../gcc-source-trunk/gcc/cp/parser.c:20832
0x7b73bf cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc-source-trunk/gcc/cp/parser.c:20868
0x7b7e61 cp_parser_function_definition_after_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:25565
0x7b8b75 cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:25477
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.
$


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


struct A
{ 
  static int x;
};

void f ()
{ 
  using ::A;
  x;
}