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Show the symbol when choice fails.

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This commit is contained in:
Rob Rix 2017-04-26 11:58:03 -04:00
parent ffbca016db
commit c85081ea6b
1 changed files with 1 additions and 1 deletions
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2
src/Data/Syntax/Assignment.hs
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@ -111,7 +111,7 @@ runAssignment = iterFreer (\ assignment yield state -> case (assignment, dropAno
yield c (advanceState state)
Choose choices -> case IntMap.lookup (fromEnum symbol) choices of
Just a -> yield a state
Nothing -> Error ["Expected " <> showChoices choices <> " but got " <> show subtree]
Nothing -> Error ["Expected " <> showChoices choices <> " but got " <> show symbol]
_ -> Error ["No rule to match " <> show subtree]
(Symbol s, AssignmentState{}) -> Error [ "Expected " <> show s <> " but got end of input." ]
(Location, state@AssignmentState{..}) -> yield (Info.Range stateOffset stateOffset :. Info.SourceSpan statePos statePos :. Nil) state