Workaround for #3462.

way it was, but this is the obvious fix for now. Review by odersky
(perhaps you could point out where my logic fails, in that I expected
the concrete return type of withHelpSyntax to contain a setter for
value.)

1 files changed, 5 insertions, 2 deletions

diff --git a/src/compiler/scala/tools/nsc/settings/AbsSettings.scala b/src/compiler/scala/tools/nsc/settings/AbsSettings.scala
index 75e2c5ce11..21608f7f05 100644
--- a/src/compiler/scala/tools/nsc/settings/AbsSettings.scala
+++ b/src/compiler/scala/tools/nsc/settings/AbsSettings.scala
@@ -69,9 +69,12 @@ trait AbsSettings {
      *  In immutable, of course they will return a new object, which means
      *  we can't use "this.type", at least not in a non-casty manner, which
      *  is unfortunate because we lose type information without it.
+     *
+     *  ...but now they're this.type because of #3462.  The immutable
+     *  side doesn't exist yet anyway.
      */
-    def withAbbreviation(name: String): Setting
-    def withHelpSyntax(help: String): Setting
+    def withAbbreviation(name: String): this.type
+    def withHelpSyntax(help: String): this.type
 
     def helpSyntax: String = name
     def abbreviations: List[String] = Nil