With help from upstream developer lukas, we know this much. "praveen: not sure if this is already known to you but this is failing
return new AST_SimpleStatement({body:(tmp=expression(true),semicolon(),tmp)})"
I wonder if the last changelog entry of ruby-uglifier is a hint
https://tracker.debian.org/media/packages/r/ruby-uglifier/changelog-2.7.2-1
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