Bug #12048: "Unknown keyword" error when calling function with keyword argument inside parameter

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]
• Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN

[devwout (Ewout VT)]

Contents of attached file ruby_bug.rb

def x(a) ; a ; end
def y(*a, b: nil) ; end
y(x(c: 1))

$ ruby ruby_bug.rb
ruby_bug.rb:2:in `y': unknown keyword: c (ArgumentError)
        from ruby_bug.rb:3:in `<main>'

Not only ruby 2.3 is affected, same hehavior on ruby 2.2.3, 2.2.4 and 2.1.

[nobu (Nobuyoshi Nakada)]

• Description updated (diff)
• Status changed from Open to Rejected

It's same as

def y(b: nil) end
x = {c: 1}
y(x)

Keyword arguments are passed as a Hash, x here.