[Bug fortran/70748] New: GCC6 Regression: ICE with debug in gfc_trans_block_construct

["antony at cosmologist dot info" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70748

            Bug ID: 70748
           Summary: GCC6 Regression: ICE with debug in
                    gfc_trans_block_construct
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: antony at cosmologist dot info
  Target Milestone: ---

Run "make Debug" on code at https://github.com/cmbant/forutils/


gfortran -cpp -ffree-line-length-none -fmax-errors=4 -MMD -g -O0 -o
IniObjects.o -c ../IniObjects.f90
../IniObjects.f90:348:0:

                         S = S(i+2:)

internal compiler error: in gfc_trans_block_construct, at
fortran/trans-stmt.c:1788
0x6e30e1 gfc_trans_block_construct(gfc_code*)
        ../../gcc/fortran/trans-stmt.c:1788
0x67f637 trans_code
        ../../gcc/fortran/trans.c:1785
0x6dac43 gfc_trans_if_1
        ../../gcc/fortran/trans-stmt.c:1299
0x6dac54 gfc_trans_if_1
        ../../gcc/fortran/trans-stmt.c:1303
0x6e188a gfc_trans_if(gfc_code*)
        ../../gcc/fortran/trans-stmt.c:1330
0x67f6a7 trans_code
        ../../gcc/fortran/trans.c:1777
0x6dac43 gfc_trans_if_1
        ../../gcc/fortran/trans-stmt.c:1299
0x6e188a gfc_trans_if(gfc_code*)
        ../../gcc/fortran/trans-stmt.c:1330
0x67f6a7 trans_code
        ../../gcc/fortran/trans.c:1777
0x6e3e2d gfc_trans_do_while(gfc_code*)
        ../../gcc/fortran/trans-stmt.c:2294
0x67f657 trans_code
        ../../gcc/fortran/trans.c:1797
0x6dac43 gfc_trans_if_1
        ../../gcc/fortran/trans-stmt.c:1299
0x6e188a gfc_trans_if(gfc_code*)
        ../../gcc/fortran/trans-stmt.c:1330
0x67f6a7 trans_code
        ../../gcc/fortran/trans.c:1777
0x6a302c gfc_generate_function_code(gfc_namespace*)
        ../../gcc/fortran/trans-decl.c:6154
0x682b21 gfc_generate_module_code(gfc_namespace*)
        ../../gcc/fortran/trans.c:2058
0x63b54d translate_all_program_units
        ../../gcc/fortran/parse.c:5600
0x63b54d gfc_parse_file()
        ../../gcc/fortran/parse.c:5819
0x67c985 gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:201
Please submit a full bug report,
with preprocessed source if appropriate.


Appeared sometime in gcc in the last couple of months, also in v7 master.