[GROOVY-733] NullpointerException instead of MissingMethodException - ASF JIRA

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from the mailing list by Martin C. Martin:

In the CVS head, if you do this:

import groovy.swing.SwingBuilder

swing = new SwingBuilder()
swing.frame() {
button(10, 'hello')
}

you'll get a NullPointerException, because the exception is in the
closure. If you do this:

import groovy.swing.SwingBuilder

swing = new SwingBuilder()
swing.frame(10, 'hello')

You get a missing method exception, as it should be.