⍝ Simple macro processor for bf:

    movl←'l=[-/<+/>] '      ⍝ move left ⍺ cell positions ("/" replicates.).

    mac movl, '2l 1l 0l'    ⍝ move left 2 1 0 (the last of which will hang BF).
[-<<+>>] [-<+>] [-+]

    mac'a=KO a=OK a'        ⍝ subsequent defns replace previous ones.
OK
    mac'a=K (a=O a)a'       ⍝ inner block defns shadow outer ones.
OK
    mac'a=OK b=a a=KO b'    ⍝ a expanded at b defn time.
OK
    mac'a=KO b=\a a=OK b'   ⍝ a expanded at b dref time.
OK
    mac'O=? b=\\\OK b'      ⍝ O not expanded.
OK
    mac'a=K b=(a=O a) ba'   ⍝ inner defn is local to block.
OK

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