[groovy] strange error message when using anonymous groovy objects

[nbauernfeind]

Description

A clear and concise description of what the bug is.

Steps to reproduce

x = new Object() {
    long get(long ii) { return ii; }
}
y = emptyTable(1).update("X = x[ii]")

Expected results

An error message of the following style:

Having trouble with the following expression:
Full expression           : x[ii]
Expression having trouble : io.deephaven.db.tables.lang.DBLanguageParser$VisitArgs@1e199514
Exception message         : Cannot find method get(long) in interface groovy.lang.GroovyObject

Actual results

/io/deephaven/temp/c415813373987228486v61_0/Formula.java:80: error: <identifier> expected
    private final io.deephaven.dynamic.Script_6.1 x;
                                               ^
/io/deephaven/temp/c415813373987228486v61_0/Formula.java:80: error: <identifier> expected
    private final io.deephaven.dynamic.Script_6.1 x;
                                                   ^
/io/deephaven/temp/c415813373987228486v61_0/Formula.java:89: error: ')' expected
        x = (io.deephaven.dynamic.Script_6.1) __params[0].getValue();

Additional details and attachments

I suspect it's a JDK upgrade side effect.

I have a fix but interferes with the PyObject #1490 - so will put up the the PR immediately when that merges.