tc←{⍺←⊢                             ⍝ Trace of function application.
    fn←⍺⍺{⍙←⍺⍺ ⋄ ~∘' ⍙'⍕⊂⎕OR'⍙'}⍵   ⍝ function representation.
    ↑⊢/⎕←⍺ fn ⍵'=>',⊂⍺ ⍺⍺ ⍵         ⍝ display and result.
}

code_colours

test script

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