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work-around in Tree.expr2tree to make Paraphrase work

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aarne
2010-12-14 14:36:05 +00:00
parent 07d95b2b3f
commit 22a3eb2f0a
2 changed files with 6 additions and 4 deletions
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src/runtime/haskell/PGF/Tree.hs
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@@ -61,7 +61,8 @@ expr2tree e = abs [] [] e
| List.null as = Meta n
| otherwise = error "meta variables of function type are not allowed in trees"
app xs as (EAbs _ x e) = error "beta redexes are not allowed in trees"
app xs as (EVar i) = Var (xs !! i)
app xs as (EVar i) = if length xs > i then Var (xs !! i) else Meta i
---- AR 14/12/2010: work-around needed in PGF.Paraphrase.fromDef
app xs as (EFun f) = Fun f as
app xs as (ETyped e _) = app xs as e