[Bug-apl] Can't break out of quad-quote

[Blake McBride]

      )CLEAR

CLEAR WS

      ∇test;x

[1] x←3

[2] →1

[3] ∇

      test

^CATTENTION

test[1]  x←3

         ^

      )CLEAR

CLEAR WS

      ∇test;x

[1] x←⍞

[2] →1

[3] ∇

      test

abc

def

^C

^C

^C

^C

^C

^C

^C

^C

^C