Improve mix operator error message

nextflow-io · Jul 17, 2020 · 8074d71 · 8074d71
1 parent 3b4b377
commit 8074d71
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/modules/nextflow/src/main/groovy/nextflow/extension/OperatorEx.groovy b/modules/nextflow/src/main/groovy/nextflow/extension/OperatorEx.groovy
@@ -1104,7 +1104,8 @@ class OperatorEx implements DelegatingPlugin {
      * @return
      */
     DataflowWriteChannel mix( DataflowReadChannel source, DataflowReadChannel[] others ) {
-        assert others.size()>0
+        if( others.size()==0 )
+            throw new IllegalArgumentException("Operator 'mix' should have at least one right operand")
 
         def target = CH.create()
         def count = new AtomicInteger( others.size()+1 )