Infinite loop causes StackOverflow retrieving MetaClass for Java class breaking Grails

Grails currently doesn't work with latest Groovy. The class

http://fisheye.codehaus.org/browse/grails/trunk/grails/src/commons/org/codehaus/groovy/grails/cli/GrailsScriptRunner.groovy?r=HEAD

Produces a StackOverflowError on line 54

grailsHome = ANT.antProject.properties.'env.GRAILS_HOME'

Groovy attempts to retrieve the MetaClass for Ant's Project class, but it never comes back, resulting in the stack overflow

This is before Grails has done any meta class magic and before even Gant has loaded. It is 5 lines into the main method of Grails' GrailsScriptRunner class that makes the "grails" command work