Deduplicate productions

package/version

@@ -1 +1 @@
-0.1.339
+0.1.340

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "pyk"
-version = "0.1.339"
+version = "0.1.340"
 description = ""
 authors = [
     "Runtime Verification, Inc. <[email protected]>",

src/pyk/kast/outer.py

@@ -1033,6 +1033,23 @@ def production_for_klabel(self, klabel: KLabel) -> KProduction:
                 _LOGGER.warning(
                     f'Discarding {len(prods) - len(_prods)} productions with `unparseAvoid` attribute for label: {klabel}'
                 )
+            # Automatically defined symbols like isInt may get multiple
+            # definitions in different modules.
+            unique_no_att: list[tuple[KProduction, KProduction]] = []
+            for prod in prods:
+                equivalent = False
+                trimmed_prod = prod.let_att(KAtt({}))
+                for _, t in unique_no_att:
+                    if t == trimmed_prod:
+                        equivalent = True
+                        break
+                if equivalent:
+                    continue
+                unique_no_att.append((prod, trimmed_prod))
+            _prods = [p for p, _ in unique_no_att]
+            if len(_prods) < len(prods):
+                prods = _prods
+                _LOGGER.warning(f'Discarding {len(prods) - len(_prods)} equivalent productions')
             try:
                 self._production_for_klabel[klabel] = single(prods)
             except ValueError as err: