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  # buggo, where's the case-sensitivity go, here or elsewhere?
  # the first subrule here...
...

v_go: direction { "(go '$item[1])" }
direction: /((?:n(?:orth)?|s(?:outh)?)?(?:e(?:ast)?|w(?:est)?)?|(?:up|
+down))/i

    Parse::RecDescent: Treating "# buggo, where's the case-sensitivity
+ go,
                       here or elsewhere?" as a comment
...

      ERROR (line 48): Untranslatable item encountered:
                       "?)?(?:e(?:ast)?|w(?:est)?)?|(?:up|down))/i"