Issue #9239 has been updated by naruse (Yui NARUSE).

Status changed from Open to Rejected

As Array#to_h says and test_to_h describes, Array#to_h is different from Hash[].
The behavior is expected one.

  Returns the result of interpreting <i>ary</i> as an array of
  <tt>[key, value]</tt> pairs. Elements other than pairs of
  values are ignored.

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Feature #9239: Array#to_h ignores flat arrays
https://bugs.ruby-lang.org/issues/9239#change-43784

Author: sawa (Tsuyoshi Sawada)
Status: Rejected
Priority: Urgent
Assignee: naruse (Yui NARUSE)
Category: core
Target version: current: 2.1.0


=begin
My understanding was that the newly introduced `Array#to_h` was to be equivalent to `Hash.[]`. But when I give a flat array, it returns an empty hash:

    [:a, :b].to_h # => {}
    [:a].to_h     # => {}

I expected `{:a => :b}` for the first example, and `ArgumentError: odd number of arguments for Hash` for the second example, as is with `Hash[]`. Was it intended to be different? If so, why is that the case? Even if it is to be different, it should at least raise an error when a flat array is given.
=end



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