diff options
Diffstat (limited to 'src/GF/Grammar/Unify.hs')
| -rw-r--r-- | src/GF/Grammar/Unify.hs | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/GF/Grammar/Unify.hs b/src/GF/Grammar/Unify.hs index 68f8b3352..f367dc891 100644 --- a/src/GF/Grammar/Unify.hs +++ b/src/GF/Grammar/Unify.hs @@ -18,9 +18,9 @@ module GF.Grammar.Unify (unifyVal) where import GF.Grammar.Abstract - import GF.Data.Operations +import Text.PrettyPrint import Data.List (partition) unifyVal :: Constraints -> Err (Constraints,MetaSubst) @@ -64,13 +64,13 @@ unify e1 e2 g = unify b c' g (App c a, App d b) -> case unify c d g of Ok g1 -> unify a b g1 - _ -> prtBad "fail unify" e1 + _ -> Bad (render (text "fail unify" <+> ppTerm Unqualified 0 e1)) (RecType xs,RecType ys) | xs == ys -> return g - _ -> prtBad "fail unify" e1 + _ -> Bad (render (text "fail unify" <+> ppTerm Unqualified 0 e1)) extend :: Unifier -> MetaSymb -> Term -> Err Unifier extend g s t | (t == Meta s) = return g - | occCheck s t = prtBad "occurs check" t + | occCheck s t = Bad (render (text "occurs check" <+> ppTerm Unqualified 0 t)) | True = return ((s, t) : g) subst_all :: Unifier -> Term -> Err Term |