Add rule in --manual to close a branch

src/main/scala/leon/synthesis/SynthesisPhase.scala

@@ -85,6 +85,10 @@ object SynthesisPhase extends LeonPhase[Program, Program] {
       case _ =>
     }
 
+    if (options.manualSearch) {
+      options = options.copy(rules = rules.AsChoose +: options.rules)
+    }
+
     options
   }
 

src/main/scala/leon/synthesis/rules/AsChoose.scala

+/* Copyright 2009-2013 EPFL, Lausanne */
+
+package leon
+package synthesis
+package rules
+
+case object AsChoose extends Rule("As Choose") {
+  def instantiateOn(sctx: SynthesisContext, p: Problem): Traversable[RuleInstantiation] = {
+      Some(new RuleInstantiation(p, this, SolutionBuilder.none, this.name) {
+        def apply(sctx: SynthesisContext) = {
+          RuleSuccess(Solution.choose(p))
+        }
+      })
+  }
+}
+