[ruby-core:55199] [ruby-trunk - Bug #8457][Open] Function arguments: Is this intended?

Issue #8457 has been updated by marcandre (Marc-Andre Lafortune).

Category set to core
Status changed from Closed to Open
Assignee set to matz (Yukihiro Matsumoto)

I'm wondering too if there isn't something strange?

I'd expect a proc to either do an implicit splat or not, but right now it looks for options before doing the implicit splat. Should it not do it after doing the implicit splat?

I thought that when a proc had an argument list with more than one element, it was the same to call it with a single array argument than with the same array splatted:

   Proc{|a, ...| ... }.call([...]) == Proc{|a, ...}| ... }.call(*[...]) # => Because of implicit splat

But we have currently:

  Proc.new{|a, *b, **c| p a, b, c}.call(1,2, bar: 3)
  # => 1, [2], {:bar=>3} : OK

  Proc.new{|a, *b, **c| p a, b, c}.call([1,2, bar: 3])
  # => 1, [2, {:bar=>3}], {}: Expected same as above

  Proc.new{|(a, *b), **c| p a, b, c}.call([1,2], bar: 3)
  # => 1, [2], {:bar=>3} : OK

  Proc.new{|(a, *b), **c| p a, b, c}.call([[1,2], bar: 3])
  # => [1, 2], [{:bar=>3}], {}: Expected same as above

So, Matz, what do you think of these simplified examples?
----------------------------------------
Bug #8457: Function arguments: Is this intended?
https://bugs.ruby-lang.org/issues/8457#change-39559

Author: boris_stitnicky (Boris Stitnicky)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: 
ruby -v: 2.0.0
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


a = [1, 2, x: 3]
a.tap { |*p, q| a.clear.concat p } #=> [1, 2]

but

a = [1, 2, x: 3]
a.tap { |*p, **q| a.clear.concat p } #=> [[...]]

and also

a = [1, 2]
a.tap { |*p| a.clear.concat p } #=> [[...]]

???


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