Compiler exception for invalid operator

A script containing this:

print "Foo" ===~ ".*"

...causes the stack trace below from the compiler. It's not valid code of course, but the compiler should give a normal error message to the user.

Stack trace:

>>> a serious error occurred: BUG! exception in phase 'class generation' in source unit '<...>Foo.groovy' Operation: ("===" at 2:13: "===" ) not supported
>>> stacktrace:
BUG! exception in phase 'class generation' in source unit '/Users/jans/src/courses/nlp-class/week4/pa4-ner/java/GroovyTest.groovy' Operation: ("===" at 2:13: "===" ) not supported
at org.codehaus.groovy.classgen.asm.BinaryExpressionHelper.eval(BinaryExpressionHelper.java:246)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitBinaryExpression(AsmClassGenerator.java:521)
at org.codehaus.groovy.ast.expr.BinaryExpression.visit(BinaryExpression.java:49)
at org.codehaus.groovy.classgen.asm.CallSiteWriter.makeCallSite(CallSiteWriter.java:301)
at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCall(InvocationWriter.java:187)
at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCall(InvocationWriter.java:89)
at org.codehaus.groovy.classgen.asm.InvocationWriter.makeInvokeMethodCall(InvocationWriter.java:73)
at org.codehaus.groovy.classgen.asm.InvocationWriter.writeInvokeMethod(InvocationWriter.java:292)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethodCallExpression(AsmClassGenerator.java:657)
at org.codehaus.groovy.ast.expr.MethodCallExpression.visit(MethodCallExpression.java:75)
at org.codehaus.groovy.classgen.asm.StatementWriter.writeReturn(StatementWriter.java:577)
at org.codehaus.groovy.classgen.asm.OptimizingStatementWriter.writeReturn(OptimizingStatementWriter.java:316)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitReturnStatement(AsmClassGenerator.java:499)
at org.codehaus.groovy.ast.stmt.ReturnStatement.visit(ReturnStatement.java:47)
at org.codehaus.groovy.classgen.asm.StatementWriter.writeBlockStatement(StatementWriter.java:80)
at org.codehaus.groovy.classgen.asm.OptimizingStatementWriter.writeBlockStatement(OptimizingStatementWriter.java:155)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitBlockStatement(AsmClassGenerator.java:449)
at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:69)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:101)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:112)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitStdMethod(AsmClassGenerator.java:313)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitConstructorOrMethod(AsmClassGenerator.java:270)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitMethod(ClassCodeVisitorSupport.java:123)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethod(AsmClassGenerator.java:390)
at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1056)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:50)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitClass(AsmClassGenerator.java:174)
at org.codehaus.groovy.control.CompilationUnit$14.call(CompilationUnit.java:767)
at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:967)
at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:546)
at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:524)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:501)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:480)
at org.codehaus.groovy.tools.FileSystemCompiler.compile(FileSystemCompiler.java:60)
at org.codehaus.groovy.tools.FileSystemCompiler.doCompilation(FileSystemCompiler.java:216)
at org.codehaus.groovy.tools.FileSystemCompiler.commandLineCompile(FileSystemCompiler.java:149)
at org.codehaus.groovy.tools.FileSystemCompiler.commandLineCompileWithErrorHandling(FileSystemCompiler.java:179)
at org.codehaus.groovy.tools.FileSystemCompiler.main(FileSystemCompiler.java:163)
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:597)
at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:108)
at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:130)