We had a typo in some old code to concatenate a couple things that basically looked like this:
The mistake here is the second &= that should just be a &.
Under ACF 10, this works.
Under Lucee 5 running on Tomcat 8.5.3 on Windows, it crashes the whole server with a core dump that begins:
Under Linux, Tomcat is fine and Lucee reports a java.lang.verifyError error:
Arguably, nobody has any business doing a &= b &= c to begin with, so this certainly isn't a priority, but given that it brought down Tomcat on our Windows box I figured I'd report my embarrassing typo that ACF let me get away with for so long.
Win 10 x64 / JRE 1.8.0 u91 & u92 (tomcat crashes, core dump)
Ubuntu Linux 16.x / JRE 1.8.0 u91 & u92 (lucee errors out with verifyLang Java error)