Fortran 2008 (and earlier) have:

"3.3.3.5 Fixed form statements"
"The program unit END statement shall not be continued. A statement whose initial line appears to be a program unit END statement shall not be continued."

(That applies to all END: "A program unit is a main program, an
external subprogram, a module, a submodule, or a block data program unit.")

gfortran currently does not diagnose this:

a) EXAMPLE 1: initial line appears to be a program unit END statement
------------
      integer :: ender
      end
     +er = 5
      print *, ender
      end

b) EXAMPLE 2: END statement which is continued
------------
      subroutine test
      end
     * subroutine test


Expected: With -std=f2008 / -pedantic, the continuation line is rejected / being warned for - with -std=gnu/legacy it is accepted. Intel's ifort prints with -stand f03:

test.f(2): error #5269: Operator END of program unit cannot be continued.
      end
------^

Though I do not like Intel's wording.