[False positive] Performance/RedundantMatch on #match with block

[TheLonelyGhost]

$ rubocop -V
0.36.0 (using Parser 2.3.0.1, running on ruby 2.2.3 x86_64-darwin15)

Example code:

# Setter that parses out array-like syntax from the given `attr`
# EXAMPLE:
#
#     foo = {}
#     foo['derp'] = [ 'hello', 'world' ]
#     assign(foo, 'derp[1]', 'TheLonelyGhost')
#     foo['derp']
#     # => ['hello', 'TheLonelyGhost']
#
def assign(obj, attr, value)
  key = attr
  me = obj

  /^(?<hash_key>.+)\[(?<array_key>[0-9]+)\]$/.match(key) do |m|
    key = m[:array_key].to_i
    obj[m[:hash_key]] ||= []

    me = obj[m[:hash_key]]
  end

  me[key] = value
end

Rubocop Errors thrown:

C: Performance/RedundantMatch: Use `=~` in places where the `MatchData` returned by `#match` will not be used.

Problem:

This is incorrect. MatchData is being used here inside of the block, as per the example in Ruby Docs

If a block is given, invoke the block with MatchData if match succeed, so that you can write
pat.match(str) {|m| ...}
instead of

Workaround:

Add the following to .rubocop.yml:

Performance/RedundantMatch:
  Enabled: false