GroovyEclipse RunAs Groovy doesn't check for a main method with the wrong kind of arguments

GroovyEclipse tries to run:

class MyClass {
static void main()

}

And then fails with:
java.lang.NoSuchMethodError: main
Exception in thread "main"

Both the commandline and GroovyJ have a more meaningful message:
Caught: groovy.lang.GroovyRuntimeException: This script or class could not be run.
It should either:

• have a main method,
• be a class extending GroovyTestCase,
• or implement the Runnable interface.

GroovyJ also lets you select this class as a runnable class when
setting up a run configuration. This class should be weeded out of
the list of available classes.

The main reason behind this is that EclipsePlugin is doing a partial
check look for main and then static (and currently also incorrectly void - See Groovy-1394)
but doesn't check for Object[] args.