__dir__ does not return canonicalized absolute path #4689
Description
blah.rb
p __dir__
p File.dirname(File.realpath(__FILE__))
Environment
jruby 9.1.12.0 (2.3.3) 2017-06-15 33c6439 Java HotSpot(TM) 64-Bit Server VM 25.121-b13 on 1.8.0_121-b13 +jit [darwin-x86_64]
Darwin mac-mini.local 15.6.0 Darwin Kernel Version 15.6.0: Mon Jan 9 23:07:29 PST 2017; root:xnu-3248.60.11.2.1~1/RELEASE_X86_64 x86_64
Expected Behavior
% ruby -v
ruby 2.3.4p301 (2017-03-30 revision 58214) [x86_64-darwin15]
% ruby blah.rb
"/Users/xxxxxx/Desktop/__dir__test"
"/Users/xxxxxx/Desktop/__dir__test"
Actual Behavior
% jruby -v
jruby 9.1.12.0 (2.3.3) 2017-06-15 33c6439 Java HotSpot(TM) 64-Bit Server VM 25.121-b13 on 1.8.0_121-b13 +jit [darwin-x86_64]
% jruby blah.rb
"."
"/Users/xxxxxx/Desktop/__dir__test"
Reference
http://ruby-doc.org/core-2.3.3/Kernel.html#method-i-__dir__
__dir__
Returns the canonicalized absolute path of the directory of the file from which this
method is called. It means symlinks in the path is resolved. If __FILE__ is nil, it
returns nil. The return value equals to File.dirname(File.realpath(__FILE__)).
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