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53 Gets rid of typing rule for record identifiers by mikesol · Pull Request #4380 · purescript/purescript · GitHub
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Gets rid of typing rule for record identifiers #4380

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Gets rid of typing rule for record identifiers #4380

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14 changes: 2 additions & 12 deletions src/Language/PureScript/TypeChecker/Types.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -369,20 +369,10 @@ infer' (Literal ss (ArrayLiteral vals)) = do
return $ TypedValue' True (Literal ss (ArrayLiteral ts')) (srcTypeApp tyArray els)
infer' (Literal ss (ObjectLiteral ps)) = do
ensureNoDuplicateProperties ps
-- We make a special case for Vars in record labels, since these are the
-- only types of expressions for which 'infer' can return a polymorphic type.
-- They need to be instantiated here.
let shouldInstantiate :: Expr -> Bool
shouldInstantiate Var{} = True
shouldInstantiate (PositionedValue _ _ e) = shouldInstantiate e
shouldInstantiate _ = False

inferProperty :: (PSString, Expr) -> m (PSString, (Expr, SourceType))
let inferProperty :: (PSString, Expr) -> m (PSString, (Expr, SourceType))
inferProperty (name, val) = do
TypedValue' _ val' ty <- infer val
valAndType <- if shouldInstantiate val
then instantiatePolyTypeWithUnknowns val' ty
else pure (val', ty)
valAndType <- instantiatePolyTypeWithUnknowns val' ty
pure (name, valAndType)

toRowListItem (lbl, (_, ty)) = srcRowListItem (Label lbl) ty
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