alias x y + 1
          ^ unexpected '+', expecting end-of-input
          ^ unexpected '+', ignoring it
alias x y.z
         ^ unexpected '.', expecting end-of-input
         ^ unexpected '.', ignoring it
BEGIN { bar } + 1
              ^ unexpected '+', expecting end-of-input
              ^ unexpected '+', ignoring it
BEGIN { bar }.z
             ^ unexpected '.', expecting end-of-input
             ^ unexpected '.', ignoring it
END { bar } + 1
            ^ unexpected '+', expecting end-of-input
            ^ unexpected '+', ignoring it
END { bar }.z
           ^ unexpected '.', expecting end-of-input
           ^ unexpected '.', ignoring it
undef x + 1
        ^ unexpected '+', expecting end-of-input
        ^ unexpected '+', ignoring it
undef x.z
       ^ unexpected '.', expecting end-of-input
       ^ unexpected '.', ignoring it