diff options
| author | Eduardo Julian | 2016-10-20 21:05:26 -0400 |
|---|---|---|
| committer | Eduardo Julian | 2016-10-20 21:05:26 -0400 |
| commit | f9f2b9bab9651c75eb5c884276e8d8c6449ef16d (patch) | |
| tree | 352c1d3f69cf19544620b77d75e62d5d65c53504 /src | |
| parent | fe4bc44942263e435399e0a62d5069c8d28a901a (diff) | |
- Added code for handling some corner cases in the type-checker.
Diffstat (limited to 'src')
| -rw-r--r-- | src/lux/type.clj | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/src/lux/type.clj b/src/lux/type.clj index 87c330691..774d6b4d8 100644 --- a/src/lux/type.clj +++ b/src/lux/type.clj @@ -11,7 +11,8 @@ (lux [base :as & :refer [|do return* return fail fail* assert! |let |case]]) [lux.type.host :as &&host])) -(declare show-type) +(declare show-type + type=) ;; [Utils] (defn |list? [xs] @@ -196,7 +197,9 @@ (if-let [tvar (->> state (&/get$ &/$type-vars) (&/get$ &/$mappings) (&/|get id))] (|case tvar (&/$Some bound) - (fail* (str "[Type Error] Can't rebind type var: " id " | Current type: " (show-type bound))) + (if (type= type bound) + (return* state nil) + (fail* (str "[Type Error] Can't re-bind type var: " id " | Current type: " (show-type bound)))) (&/$None) (return* (&/update$ &/$type-vars (fn [ts] (&/update$ &/$mappings #(&/|put id (&/$Some type) %) @@ -710,11 +713,23 @@ (return* state* output) (&/$Left _) - ((|do [fixpoints* (check* class-loader fixpoints invariant?? (&/$VarT ?id) F2) - e* (apply-type F2 A1) - a* (apply-type F2 A2)] - (check* class-loader fixpoints* invariant?? e* a*)) - state))) + (|case F2 + (&/$UnivQ (&/$Cons _) _) + ((|do [actual* (apply-type F2 A2)] + (check* class-loader fixpoints invariant?? expected actual*)) + state) + + (&/$ExT _) + ((|do [fixpoints* (check* class-loader fixpoints invariant?? (&/$VarT ?id) F2)] + (check* class-loader fixpoints* invariant?? A1 A2)) + state) + + _ + ((|do [fixpoints* (check* class-loader fixpoints invariant?? (&/$VarT ?id) F2) + e* (apply-type F2 A1) + a* (apply-type F2 A2)] + (check* class-loader fixpoints* invariant?? e* a*)) + state)))) [(&/$AppT F1 A1) (&/$AppT (&/$VarT ?id) A2)] (fn [state] |