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more permissive, e.g. for system operations as in 678e00851cfb;
authorwenzelm
Thu, 04 May 2017 15:10:51 +0200
changeset 65718 79be5b464a16
parent 65717 556c34fd0554
child 65720 c5b19f997214
child 65721 01fc771021e6
more permissive, e.g. for system operations as in 678e00851cfb;
src/Pure/library.scala file | annotate | diff | comparison | revisions 
--- a/src/Pure/library.scala	Thu May 04 14:58:19 2017 +0200
+++ b/src/Pure/library.scala	Thu May 04 15:10:51 2017 +0200
@@ -145,7 +145,7 @@
   def trim_substring(s: String): String = new String(s.toCharArray)
 
   def proper_string(s: String): Option[String] =
-    if (s == "") None else Some(s)
+    if (s == null || s == "") None else Some(s)
 
 
   /* quote */
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