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diff --git a/test/dz_rt b/test/dz_rt
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+#!/usr/bin/env dbqn
+
+# Compile and run the primitive implementations, and prim.bqn
+
+impl ← •LNS •path∾"../src/r.bqn"
+
+drun ← •EX •path∾"../dc.bqn"
+
+chrs←⟨
+  "!+-×÷⋆√⌊⌈∧∨¬|=≠≤<>≥≡≢⊣⊢⥊∾≍↑↓↕⌽⍉/⍋⍒⊏⊑⊐⊒∊⍷⊔"
+  "˙˜˘¨⌜⁼´˝`"
+  "∘⊸⟜○⌾⎉⚇⍟◶⊘"
+⟩
+nc ← ≠¨chrs
+chr ← ∾chrs
+itr ← 0⥊˜≠chr
+
+init ← " "⊸∾¨(/⟜"_"¨nc/0‿1‿1)∾¨(nc/"FMD")∾¨(nc+´⊸↑⥊"ABC"∾⌜•a)
+post ← ∾⟜" "¨/⟜"_"¨nc/0‿0‿1
+names ← init∾¨'0'∾¨post
+
+Inc ← {
+  i←⊑chr⊐𝕩
+  n←0 ⋄ itr↩{n↩1+𝕩}⌾(i⊑⊢)itr
+  names↩((i⊑init)∾('0'+n)∾i⊑post)⌾(i⊑⊢)names
+}
+
+# built-in assumptions
+Mod ← {((⊑chr⊐𝕨)⊑names) ∾ " ← " ∾ 𝕩}
+
+pre ← ⟨
+  "IsArray ← 0≠≡"
+  "Type    ← ⟨⟩⥊0⊸⥊"
+  "Log     ← ⋆⁼"
+  "GroupLen← ≠¨⊔"
+  "GroupOrd← ∾⊔∘⊢"
+  '!' Mod "{𝕩 ⋄ ≤1}⍟(1≢⊢)"
+⟩∾Mod⟜⥊¨ "+-×÷⋆⌊=≤≢⥊⊑↕⌜`⊘"
+
+
+# checks if line is a builtin redefinition
+E_isdef ← (3≤≠)◶⟨0,∧´⟨chr," ","←↩"⟩∊˜¨3⊸↑⟩
+
+# removes comments and replaces built-ins with names
+E_proc ← {
+  l←≠chr
+  q←≠`𝕩='"' ⋄ q∨↩≠`q<𝕩=''' ⋄ f←¬∨`q<𝕩='#'
+  ∾ (((l×f/q)+chr⊸⊐) (≥⟜l)◶⟨⊑⟜names,⥊∘⊢⟩¨ ⊢) f/𝕩
+}
+
+E_redef ← { # handles [fmd] [←↩]
+  tail ← E_proc 3↓𝕩 # must use old def
+  Inc ⊑𝕩
+  (E_proc 1↑𝕩) ∾ "←" ∾ tail
+}
+
+pre ∾↩ E_isdef◶E_proc‿E_redef¨ impl
+t ← (¬∘⊑':'∊⊢)¨⊸/ 3⊸↓⌾(3⊸⊑) •LNS •path∾"prim.bqn"
+res ← DRun ∾ ∾⟜(@+10)¨ pre ∾ E_proc¨ t
+• ← ("All "∾(⍕≠res)∾" passed!")⍟(0=≠) /res