"Useless" warnings have file as "null" #5597
Description
Pretty sure this used to work. Seems like it's getting a dummy position out of the parser for these nodes. Memory-saving measure gone awry?
[--dev] ~/projects/jruby $ jruby -w -e '1'
null:1: warning: Useless use of a literal in void context.
[--dev] ~/projects/jruby $ jruby -w -e 'defined? 1'
null:1: warning: Useless use of defined? in void context.
This may affect other parser warnings but I did not investigate.
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