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bugfix in record subtyping checking

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krasimir
2017-03-07 17:53:56 +00:00
parent 5ec43f2f75
commit 2e5499ba97
1 changed files with 7 additions and 2 deletions
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7
src/compiler/GF/Compile/TypeCheck/ConcreteNew.hs
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@@ -476,7 +476,12 @@ subsCheckRho ge scope t ty1@(VRecType rs1) ty2@(VRecType rs2) = do -- Rule
return (l, (mb_ty,t))
(scope,mkProj,mkWrap) <- mkAccess scope t
rs <- sequence [mkField scope l t ty1 ty2 | (l,ty2) <- rs2, Just ty1 <- [lookup l rs1], Just t <- [mkProj l]]
let fields = [(l,ty2,lookup l rs1) | (l,ty2) <- rs2]
case [l | (l,_,Nothing) <- fields] of
[] -> return ()
missing -> tcError ("Missing fields:" <+> hsep missing)
rs <- sequence [mkField scope l t ty1 ty2 | (l,ty2,Just ty1) <- fields, Just t <- [mkProj l]]
return (mkWrap (R rs))
subsCheckRho ge scope t tau1 tau2 = do -- Rule EQ
unify ge scope tau1 tau2 -- Revert to ordinary unification