[Bug fortran/71936] New: ICE in wide_int_to_tree, at tree.c:1487

["gerhard dot steinmetz dot fortran at t-online dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71936

            Bug ID: 71936
           Summary: ICE in wide_int_to_tree, at tree.c:1487
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerhard.steinmetz.fortran@t-online.de
  Target Milestone: ---

Looking at "class" and 4 combinations allocatable|pointer, the following
cases give an ICE with gfortran 7 and 6 (not with 5, 4.9, 4.8).


$ cat z1.f90
program p
   type t
   end type
   class(t), allocatable :: x(:)
   allocate (x, mold=f())
   deallocate (x)
   allocate (x, source=f())
contains
   function f()
      class(t), allocatable :: f(:)
      ! delivers no data
   end
end


$ cat z2.f90
program p
   type t
   end type
   class(t), allocatable :: x(:)
   allocate (x, mold=f())
   deallocate (x)
   allocate (x, source=f())
contains
   function f()
      class(t), pointer :: f(:)
   end
end



$ gfortran-5 z1.f90
z1.f90:5:13:

    allocate (x, mold=f())
             1
Error: Array specification required in ALLOCATE statement at (1)
z1.f90:7:13:

    allocate (x, source=f())
             1
Error: Array specification required in ALLOCATE statement at (1)
$


$ gfortran-7-20160717 z1.f90
z1.f90:5:0:

    allocate (x, mold=f())

internal compiler error: in wide_int_to_tree, at tree.c:1487
0xeb3f53 wide_int_to_tree(tree_node*,
generic_wide_int<wide_int_ref_storage<false> > const&)
        ../../gcc/tree.c:1487
0xeb41d6 build_int_cst(tree_node*, long)
        ../../gcc/tree.c:1295
0x71f88b gfc_allocate_allocatable(stmtblock_t*, tree_node*, tree_node*,
tree_node*, tree_node*, tree_node*, tree_node*, tree_node*, gfc_expr*)
        ../../gcc/fortran/trans.c:794
0x7a013e gfc_trans_allocate(gfc_code*)
        ../../gcc/fortran/trans-stmt.c:5876
0x71c407 trans_code
        ../../gcc/fortran/trans.c:1838
0x74b218 gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.c:6207
0x6d6cc0 translate_all_program_units
        ../../gcc/fortran/parse.c:5916
0x6d6cc0 gfc_parse_file()
        ../../gcc/fortran/parse.c:6122
0x719192 gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:198