Improve error message

Signed-off-by: Paolo Di Tommaso <[email protected]>

modules/nextflow/src/main/groovy/nextflow/script/params/BaseParam.groovy

@@ -18,7 +18,7 @@ package nextflow.script.params
 
 import groovy.util.logging.Slf4j
 import nextflow.exception.ScriptRuntimeException
-
+import nextflow.script.TokenVar
 /**
  * Base class for input/output parameters
  *
@@ -146,7 +146,25 @@ abstract class BaseParam implements Cloneable {
      * Report missing method calls as possible syntax errors.
      */
     def methodMissing( String name, def args ) {
-        throw new ScriptRuntimeException("Invalid method call `${name}(${args})` -- possible syntax error")
+        throw new ScriptRuntimeException("Invalid function call `${name}(${argsToString0(args)})` -- possible syntax error")
     }
 
+    private String argsToString0(args) {
+        if( args instanceof Object[] )
+            args = Arrays.asList(args)
+        if( args instanceof List ) {
+            final result = new ArrayList()
+            for( def it : args )
+                result.add(argsToString1(it))
+            return result.join(',')
+        }
+        return argsToString1(args)
+    }
+
+    private String argsToString1(arg) {
+        if( arg instanceof TokenVar )
+            return arg.name
+        else
+            return String.valueOf((Object)arg)
+    }
 }

modules/nextflow/src/test/groovy/nextflow/script/params/ParamsInTest.groovy

@@ -1001,10 +1001,11 @@ class ParamsInTest extends Dsl2Spec {
             }
             '''
         when:
-        def process = parseAndReturnProcess(text)
+        parseAndReturnProcess(text)
 
         then:
-        thrown(ScriptRuntimeException)
+        def e = thrown(ScriptRuntimeException)
+        e.message == 'Invalid function call `val(y)` -- possible syntax error'
     }
 
 }