[Bug fortran/91717] New: ICE on concatenating deferred-length character and character literal

[damian at sourceryinstitute dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91717

            Bug ID: 91717
           Summary: ICE on concatenating deferred-length character and
                    character literal
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: damian at sourceryinstitute dot org
  Target Milestone: ---

$cat concat-deferred-len.f90 
  type core
    character (len=:), allocatable :: msg
  end type

  type(core) :: my_core

  my_core%msg = my_core%msg//"message"

end
$gfortran concat-deferred-len.f90 
f951: internal compiler error: in gfc_dep_resolver, at
fortran/dependency.c:2284
0x8a087d gfc_dep_resolver(gfc_ref*, gfc_ref*, gfc_reverse*, bool)
       
/home/rouson/Desktop/opencoarrays/prerequisites/downloads/trunk/gcc/fortran/dependency.c:2284
0x8a0a32 gfc_check_dependency(gfc_expr*, gfc_expr*, bool)
       
/home/rouson/Desktop/opencoarrays/prerequisites/downloads/trunk/gcc/fortran/dependency.c:1295
0x943a61 realloc_string_callback
       
/home/rouson/Desktop/opencoarrays/prerequisites/downloads/trunk/gcc/fortran/frontend-passes.c:284
0x946a29 gfc_code_walker(gfc_code**, int (*)(gfc_code**, int*, void*), int
(*)(gfc_expr**, int*, void*), void*)
       
/home/rouson/Desktop/opencoarrays/prerequisites/downloads/trunk/gcc/fortran/frontend-passes.c:5029
0x948082 realloc_strings
       
/home/rouson/Desktop/opencoarrays/prerequisites/downloads/trunk/gcc/fortran/frontend-passes.c:1519
0x94818f gfc_run_passes(gfc_namespace*)
       
/home/rouson/Desktop/opencoarrays/prerequisites/downloads/trunk/gcc/fortran/frontend-passes.c:177
0x86f037 gfc_resolve(gfc_namespace*)
       
/home/rouson/Desktop/opencoarrays/prerequisites/downloads/trunk/gcc/fortran/resolve.c:17148
0x85c3a0 resolve_all_program_units
       
/home/rouson/Desktop/opencoarrays/prerequisites/downloads/trunk/gcc/fortran/parse.c:6192
0x85c3a0 gfc_parse_file()
       
/home/rouson/Desktop/opencoarrays/prerequisites/downloads/trunk/gcc/fortran/parse.c:6439
0x8a83cf gfc_be_parse_file
       
/home/rouson/Desktop/opencoarrays/prerequisites/downloads/trunk/gcc/fortran/f95-lang.c:204
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$gfortran --version
GNU Fortran (GCC) 10.0.0 20190904 (experimental)