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more user friendly error for overload resolution failure

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This commit is contained in:
Krasimir Angelov
2025-11-14 11:27:18 +01:00
parent 8282b3e4ce
commit 08bd669200
1 changed files with 13 additions and 7 deletions
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src/compiler/api/GF/Compile/TypeCheck/Concrete.hs
+13 -7
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@@ -632,14 +632,14 @@ resolveOverloads scope c t0 q args mb_ty = do
(c2,c3) = split c23
(t,ty) <- reapply1 scope c1 t (eval g [] c2 ty []) args
instSigma scope c3 t ty mb_ty
Ok ttys -> do let (c1,c23) = split c
Ok ttys0 -> do let (c1,c23) = split c
(c2,c3) = split c23
sz <- checkpoint
arg_tys <- mapCM (checkArg g) c1 args
let v_ttys = mapC (\c (t,ty) -> (t,eval g [] c ty [])) c2 ttys
let v_ttys = mapC (\c (t,ty) -> (t,eval g [] c ty [])) c2 ttys0
try sz
(\(fun,fun_ty) -> reapply2 scope c3 fun fun_ty arg_tys mb_ty)
(\ttys -> fmap (\(ts,ty) -> (mkFV ts,ty)) (snd (minimum g ttys)))
(\ttys -> fmap (\(ts,ty) -> (mkFV ts,ty)) (snd (minimum g ttys0 arg_tys ttys)))
v_ttys
where
checkArg g c (ImplArg arg) = do
@@ -656,12 +656,18 @@ resolveOverloads scope c t0 q args mb_ty = do
mkFV [t] = t
mkFV ts = FV ts
minimum g [] = (maxBound,err)
minimum g ttys0 arg_tys [] = (maxBound,err)
where
err = evalError (pp "Overload resolution failed")
minimum g (tty@(t,ty):ttys) =
err = evalError ("Overload resolution failed" $$
"of term " <+> pp (foldl App (Q q) args) $$
"with alternatives" $$
nest 4 (vcat [pp (snd q) <+> pp ':' <+> ppTerm Terse 0 ty | (_,ty) <- ttys0]) $$
"and argument types" $$
nest 4 (fsep (punctuate (pp ',') [ppValue Terse 0 ty | (_,_,ty) <- arg_tys])))
minimum g ttys0 arg_tys (tty@(t,ty):ttys) =
let a = arity ty
(a',res) = minimum g ttys
(a',res) = minimum g ttys0 arg_tys ttys
in case compare a a' of
GT -> (a',res)
EQ -> (a',join t ty res)