Before:
  runtime ale_linters/fortran/gcc.vim

After:
  call ale#linter#Reset()

Execute(The fortran handler should parse lines from GCC 6.3.1 correctly):
  AssertEqual
  \ [
  \   {
  \     'bufnr': 337,
  \     'lnum': 3,
  \     'col': 12,
  \     'text': "Symbol ‘a’ at (1) has no IMPLICIT type",
  \     'type': 'E',
  \   },
  \   {
  \     'bufnr': 337,
  \     'lnum': 4,
  \     'col': 12,
  \     'text': "Symbol ‘b’ at (1) has no IMPLICIT type",
  \     'type': 'E',
  \   },
  \ ],
  \ ale_linters#fortran#gcc#Handle(337, [
  \   "<stdin>:3:12:",
  \   "",
  \   "Error: Symbol ‘a’ at (1) has no IMPLICIT type",
  \   "<stdin>:4:12:",
  \   "",
  \   "Error: Symbol ‘b’ at (1) has no IMPLICIT type",
  \ ])