Fix syntax error and refine which names are cached.

Author: odersky

compiler/src/dotty/tools/dotc/core/Symbols.scala

@@ -667,7 +667,8 @@ object Symbols {
         case None =>
           val idSet = mutable.SortedSet[String]()
           tree.foreachSubTree {
-            case tree: tpd.NameTree if tree.name.isInstanceOf[SimpleName] => idSet += tree.name.toString
+            case tree: tpd.NameTree if tree.name.toTermName.isInstanceOf[SimpleName] =>
+              idSet += tree.name.toString
             case _ =>
           }
           val ids = idSet.toArray

language-server/src/dotty/tools/languageserver/DottyLanguageServer.scala

@@ -65,7 +65,7 @@ class DottyLanguageServer extends LanguageServer
 
       myDrivers = new mutable.HashMap
       for (config <- configs) {
-        implicit class updateDeco(ss: List[String]): List[String] {
+        implicit class updateDeco(ss: List[String]) {
           def update(pathKind: String, pathInfo: String) = {
             val idx = ss.indexOf(pathKind)
             val ss1 = if (idx >= 0) ss.take(idx) ++ ss.drop(idx + 2) else ss