Bug #21402: ruby2_keywords affects methods/procs with post arguments

• Status: Open
• Assignee: -
• Target version: -
• Backport: 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED

[jeremyevans0 (Jeremy Evans)]

I believe this is an oversight. We forgot to consider post arguments during the development of ruby2_keywords. I believe we should not allow ruby2_keywords on methods/procs with post arguments. Example:

def a(*c, **kw) [c, kw] end
def b(*a, b) a(*a, b) end
ruby2_keywords(:b)

b({foo: 1}, bar: 1)
# Currently: [[{foo: 1}], {bar: 1}]
#  Expected: [[{foo: 1}, {bar: 1}], {}]

I think the current behavior is unexpected and undesired, because instead of flagging the last element in the splat array, it flags a post argument.

I've submitted a pull request to fix this: https://github.com/ruby/ruby/pull/13475