Less than ideal error message when incorrectly trying to use optional parenthesis

The script:

adob = new ArrayList ( )
adob.add "hello"
println adob.get 0

generates the following error report. The report is seemingly incorrect (why should it be expecting EOF) and say nothing about the real problem which is that the ( was not found. The problem is in the error reporting not in the grammar.

Caught: General error during parsing: expecting EOF, found '0'

/home/users/russel/Progs/Groovy/./topLevel.groovy:5:18: expecting EOF, found '0'
at antlr.Parser.match(Parser.java:211)
at org.codehaus.groovy.antlr.parser.GroovyRecognizer.compilationUnit(GroovyRecognizer.java:675)
at org.codehaus.groovy.antlr.AntlrParserPlugin.parseCST(AntlrParserPlugin.java:79)
at org.codehaus.groovy.control.SourceUnit.parse(SourceUnit.java:297)
at org.codehaus.groovy.control.CompilationUnit$3.call(CompilationUnit.java:352)
at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:594)
at org.codehaus.groovy.control.CompilationUnit.parse(CompilationUnit.java:343)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:313)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:235)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:204)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:154)
at groovy.lang.GroovyShell$1.run(GroovyShell.java:261)
at java.security.AccessController.doPrivileged(Native Method)
at groovy.lang.GroovyShell.run(GroovyShell.java:259)
at groovy.lang.GroovyShell.run(GroovyShell.java:202)
at groovy.ui.GroovyMain.processOnce(GroovyMain.java:397)
at groovy.ui.GroovyMain.run(GroovyMain.java:233)
at groovy.ui.GroovyMain.process(GroovyMain.java:219)
at groovy.ui.GroovyMain.main(GroovyMain.java:123)
at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:429)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)