refpath←{⍺←⍵            ⍝ Refs path from root to ⍵.
    parent←⍵.##         ⍝ parent of current space.
    parent=⍵:,⍺         ⍝ ⍵ must be # or ⎕SE.
    (parent,⍺)∇ parent  ⍝ accumulated path.
}

code_colours

test script

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