warning: Ambiguous first argument #3946
Description
Environment
jruby 9.1.0.0 - 9.1.2.0
Expected Behavior
$ jruby -we 'p({x:-1})'
-e:1: warning: Ambiguous first argument; make sure.
{:x=>-1}
Actual Behavior
jruby 9.0.5.0
$ jruby -we 'p({x:-1})'
{:x=>-1}
ruby 2.3.1
$ ruby -we 'p({x:-1})'
{:x=>-1}