RubyParser translation for stabby lambdas with it

[presidentbeef]

Similar to #3409

However, I'm a little confused and I may be missing something.

The tests pass (as you can see) and the expected output in Prism's test is:

s(:iter, s(:lambda), s(:args), (:call, nil, :it))

However, when I run RubyParser myself, I get

3.4.2 :002 > RubyParser.new.parse('-> { it }')
 => s(:iter, s(:lambda), 0, s(:call, nil, :it)) 

I honestly can't explain the discrepancy. 😕

[Earlopain]

I honestly can't explain the discrepancy

This one causes it, can't tell why though

prism/test/prism/ruby/ruby_parser_test.rb

Lines 18 to 24 in 3e8066e

	Sexp.prepend(
	Module.new do
	def ==(other)
	super && line == other.line && file == other.file # && line_max == other.line_max
	end
	end
	)

Overall it would still be parsed as 3.3 since there is no released version of ruby_parser to compare against. Though that monkeypatch seems to change some things.

[presidentbeef]

AHHH thank you @Earlopain!

Prism should not do this, because there is code in RubyParser where it is comparing a Sexp with a line/file to a fresh Sexp with no line/file and changing its behavior as a result (example).

Updated this PR to fix.

[kddnewton]

Nice!