[Bug fortran/67526] ICE on missing end parenthesis in substring construct

[gerhard.steinmetz.fortran@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67526

--- Comment #1 from Gerhard Steinmetz <gerhard.steinmetz.fortran@t-online.de> ---
Whereas :

$ cat y1.f90
program p
   character(3) :: z = 'abc'
   character :: c1 = z(3:
end

$ gfortran y1.f90
y1.f90:3:24:

    character :: c1 = z(3:
                        1
Error: Syntax error in argument list at (1)