Truffleruby: Publicly sending #lambda to Kernel doesn't result in a lambda

[havenwood]

The #lambda method normally returns a lambda:

lambda {}.lambda?
#=> true

Kernel.send {}.lambda?
#=> true

Kernel.__send__ {}.lambda?
#=> true

In CRuby and JRuby, publicly sending #lambda to Kernel also results in a lambda, but not-so in TruffleRuby:

Kernel.public_send(:lambda) {}.lambda?
#=> false

This seems related to the discussion in #12.

[aardvark179]

Thank you for the bug report. Creating lambdas has to take note of whether the block is a literal, and determining that depends on knowing the caller, and ignoring send when it comes between the lambda method and the real caller. We correctly skipped send and __send__, but public_send is a different method and wasn't being skipped correctly.

I'll submit a fix for this.

[nirvdrum]

This was fixed in ccdf00533257513278a8c78772c7ae84d7ea7261 and will be available in our next release. Thanks for comprehensive bug report!