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type checking pattern bindings

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aarne
2006-01-13 13:47:15 +00:00
parent acd24331af
commit 90c7caa788
2 changed files with 19 additions and 8 deletions
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20
src/GF/Compile/CheckGrammar.hs
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@@ -697,16 +697,26 @@ pattContext env typ p = case p of
g <- pattContext env typ p
return $ (x,typ):g
PAlt p q -> do
g1 <- pattContext env typ p
PAlt p' q -> do
g1 <- pattContext env typ p'
g2 <- pattContext env typ q
return $ filter (flip elem g1) g2 -- must be in both
let pts = [pt | pt <- g1, notElem pt g2] ++ [pt | pt <- g2, notElem pt g1]
checkCond
("incompatible bindings of" +++
unwords (nub (map (prt . fst) pts))+++
"in pattern alterantives" +++ prt p) (null pts)
return g1 -- must be g1 == g2
PSeq p q -> do
g1 <- pattContext env typ p
g2 <- pattContext env typ q
return $ g1 ++ g2
PRep p -> pattContext env typeStr p
PNeg p -> pattContext env typeStr p
PRep p' -> do
co <- pattContext env typeStr p'
if not (null co)
then checkWarn ("no variable bound inside * pattern" +++ prt p)
>> return []
else return []
PNeg p' -> pattContext env typ p'
_ -> return [] ---- check types!
where