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Add clarification to "expected foo, inferred bar" type of error msgs

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This commit is contained in:
Inari Listenmaa
2020-06-04 19:57:10 +02:00
parent a4e3bce6bb
commit c0714b7d33
1 changed files with 6 additions and 4 deletions
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10
src/compiler/GF/Compile/TypeCheck/RConcrete.hs
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@@ -132,7 +132,7 @@ inferLType gr g trm = case trm of
let term = ppTerm Unqualified 0 f
funName = pp . head . words .render $ term
in checkError ("A function type is expected for" <+> term <+> "instead of type" <+> ppType fty $$
"\n Maybe you gave too many arguments to" <+> funName)
"\n ** Maybe you gave too many arguments to" <+> funName <+> "\n")
S f x -> do
(f', fty) <- inferLType gr g f
@@ -432,7 +432,9 @@ checkLType gr g trm typ0 = do
else do b' <- checkIn (pp "abs") $ substituteLType [(bt',z,Vr x)] b
checkLType gr ((bt,x,a):g) c b'
return $ (Abs bt x c', Prod bt' z a b')
_ -> checkError $ "function type expected instead of" <+> ppType typ
_ -> checkError $ "function type expected instead of" <+> ppType typ $$
"\n ** Double-check that the type signature of the operation" $$
"matches the number of arguments given to it.\n"
App f a -> do
over <- getOverload gr g (Just typ) trm
@@ -652,11 +654,11 @@ checkEqLType gr g t u trm = do
(0,0) -> pp "" -- None of the types is a function
_ -> if expectedType `isLessApplied` inferredType
then "Maybe you gave too few arguments to" <+> funName
else "Maybe you gave too many arguments to" <+> funName
else pp "Double-check that type signature and number of arguments match."
in checkError $ s <+> "type of" <+> term $$
"expected:" <+> expectedType $$ -- ppqType t u $$
"inferred:" <+> inferredType $$ -- ppqType u t
"\n " <+> helpfulMsg
"\n **" <+> helpfulMsg <+> "\n"
where
-- count the number of arrows in the prettyprinted term
arrows :: Doc -> Int