Run.aplf

 Run;in;b;Show;Exec;val
 :Trap 0
     :If 9=⎕NC'⎕SE.Dyalog.Array'
         Exec←⎕SE.Dyalog.Array.Deserialise
     :ElseIf 3=⎕NC'⎕SE.Link.Deserialise'
         Exec←⎕SE.Link.Deserialise
     :Else
         'Needs v17.1'⎕SIGNAL 16
     :EndIf

     Show←{
         2=⎕NC'⍵':⎕SE.Dyalog.Utils.display ⍵
         0::'[namespace]'
         r←⍵.((⊂,⊂∘∇∘⍎)¨⎕NL-2 9)
         r,←⍵.((⊂,⊂∘⎕CR)¨⎕NL-3 4)
         0 ⎕SE.Dyalog.Utils.disp⊂⎕FMT↑r[⍋r]
     }

     in←0⍴⊂''
     b←0
     :Repeat
         ⍞←6↑''
         →0/⍨'→ '(∩⍨≡⊢)'''[^'']+''|⍝.*'⎕R''⊃in,←⊂⍞
         b←+/-⌿'()[]'∘.=∊in
         ⍞←b↑''
         :If 0=b
             val←Exec in
             ⎕←Show val
             in←0⍴⊂''
         :EndIf
     :EndRepeat
 :Else
     ⎕SIGNAL⊂⎕DMX.(('EN'EN)('EM'EM)('Message'(OSError{⍵,2⌽(×≢⊃⍬⍴2⌽⍺,⊂'')/'") ("',⊃⍬⍴2⌽⍺}Message)))
 :EndTrap