rmcm←{                          ⍝ APL source with comments removed.
    cm←∨\(⍵='⍝')>≠\⍵=''''       ⍝ mask of comments.
    ⎕UCS(cm×32)+(~cm)×⎕UCS ⍵    ⍝ blanks for comments in source matrix.
}
code_colours

test script

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