changes to make build pass

src/main/scala/org/kframework/backend/skala/backendImplicits.scala

@@ -0,0 +1,21 @@
+package org.kframework.backend.skala
+import org.kframework.kore.extended.implicits._
+import org.kframework.kore
+import org.kframework.kore.implementation.{DefaultBuilders => db}
+
+/**
+  * Implicits that add to Extended Kore
+  */
+object backendImplicits {
+  implicit class ModuleWithSubsorting(m: kore.Module)(implicit definiton: kore.Definition) {
+    private lazy val subsortRelations: Set[(kore.Sort, kore.Sort)] = m.allSentences.collect({
+      case kore.SymbolDeclaration(startSort, _, Seq(endSort), att) if att.findSymbol(db.Symbol("klabel")).isEmpty => (endSort, startSort)
+    }).toSet
+
+    lazy val subsorts: POSet[kore.Sort] = POSet(subsortRelations)
+
+    lazy val sortsFor: Map[kore.Symbol, Set[kore.Sort]] = m.allSentences.collect({
+      case kore.SymbolDeclaration(s, sym, _, _) => (sym, s)
+    }).groupBy(_._1).mapValues(_.map(_._2).toSet)
+  }
+}