method_source: fix broken Procs on JRuby 9.2.0.0 #51
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Fixes pry/pry#1804
(JRuby 9.2.0.0 breaks
source_location
and therefore our test suite)JRuby 9.2.0.0 fails to fetch source code for procs because of the bug:
jruby/jruby#5262
The problem is that source_location is reported at the end of the proc, instead
of the beginning.
The way I fix it is rather dumb (rewinding back and checking if it's complete
expression) but it's isolated only to 9.2.0.0 and likely won't be needed when
another JRuby is released. However, so far it's the latest release.