[Bug c++/77545] New: ICE on valid C++11 code: in potential_constant_expression_1, at cp/constexpr.c:5480

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77545

            Bug ID: 77545
           Summary: ICE on valid C++11 code: in
                    potential_constant_expression_1, at
                    cp/constexpr.c:5480
           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
$ clang++-3.8 -c -std=c++11 small.cpp
$
$ g++-trunk -c small.cpp
small.cpp: In function ‘void f(A<int>)’:
small.cpp:10:35: sorry, unimplemented: unexpected AST of kind cleanup_stmt
   for (auto x : (A < int >[]) { a })
                                   ^
small.cpp:10:35: internal compiler error: in potential_constant_expression_1,
at cp/constexpr.c:5480
0x8c1357 potential_constant_expression_1
        ../../gcc-source-trunk/gcc/cp/constexpr.c:5480
0x8c1227 potential_constant_expression_1
        ../../gcc-source-trunk/gcc/cp/constexpr.c:5039
0x8c0511 potential_constant_expression_1
        ../../gcc-source-trunk/gcc/cp/constexpr.c:5399
0x8c1ed3 potential_constant_expression
        ../../gcc-source-trunk/gcc/cp/constexpr.c:5491
0x8c1ed3 potential_nondependent_constant_expression(tree_node*)
        ../../gcc-source-trunk/gcc/cp/constexpr.c:5533
0x8c2f62 maybe_constant_value_1
        ../../gcc-source-trunk/gcc/cp/constexpr.c:4574
0x8c2f62 maybe_constant_value(tree_node*, tree_node*)
        ../../gcc-source-trunk/gcc/cp/constexpr.c:4608
0x89e941 cp_fully_fold(tree_node*)
        ../../gcc-source-trunk/gcc/cp/cp-gimplify.c:1971
0x733375 store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ../../gcc-source-trunk/gcc/cp/typeck2.c:829
0x68ea5c check_initializer
        ../../gcc-source-trunk/gcc/cp/decl.c:6230
0x6b91fd cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc-source-trunk/gcc/cp/decl.c:6888
0x78fbc2 cp_convert_range_for(tree_node*, tree_node*, tree_node*, bool)
        ../../gcc-source-trunk/gcc/cp/parser.c:11451
0x7bfeb0 cp_parser_range_for
        ../../gcc-source-trunk/gcc/cp/parser.c:11335
0x7bfeb0 cp_parser_for
        ../../gcc-source-trunk/gcc/cp/parser.c:11236
0x7bfeb0 cp_parser_iteration_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:11735
0x7b5b79 cp_parser_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:10448
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
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.
$


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


template < typename T > struct A
{ 
  A ();
  ~A ();
  T t;
};

void f (A < int > a)
{ 
  for (auto x : (A < int >[]) { a })
    ;
}