add comment to modification in io/ClassPath.scala

Author: philwalk

compiler/src/dotty/tools/io/ClassPath.scala

@@ -132,6 +132,7 @@ object ClassPath {
       dir.list.filter(x => filt(x.name) && (x.isDirectory || isJarOrZip(x))).map(_.path).toList
 
     if (pattern == "*") lsDir(Directory("."))
+    // On Windows the JDK supports forward slash or backslash in classpath entries
     else if (pattern.endsWith(wildSuffix) || pattern.endsWith("/*")) lsDir(Directory(pattern dropRight 2))
     else if (pattern.contains('*')) {
       try {