Bug #15138: non-symbol keyword in double splat, such as **{2 => 3}, raises TypeError or not

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN

[akr (Akira Tanaka)]

I found that non-symbol keyword in double splat, such as **{2 => 3},
raises TypeError in a situation and doesn't raise in another situation:

% ./ruby -ve '
def m(*a) p a end
m(k: 1, **{2 => 3}) # [{:k=>1, 2=>3}]
m(**{4 => 5}) # hash key 4 is not a Symbol (TypeError)
'
ruby 2.6.0dev (2018-09-18 trunk 64776) [x86_64-linux]
[{:k=>1, 2=>3}]
Traceback (most recent call last):
-e:4:in `<main>': hash key 4 is not a Symbol (TypeError)

It seems another keyword argument, k: 0 here, prevent TypeError.
I think this behavior is not intentional.

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed

With the acceptance of #14183, non-symbols are allowed in keyword hash splats:

m(k: 1, **{2 => 3}) 
# [{:k=>1, 2=>3}]

m(**{4 => 5}) 
# [{4=>5}]