Syntax error if Made block argument name include space

[takaokouji]

Expected Behavior

Convert below. Spaces are replaed underscores ( _ ).

def self.ブロック名(number_or_text)
end

Then will return code tab, convert define ブロック名 (number_or_text); Underscores are not replaced spaces.

Actual Behavior

Steps to Reproduce

Made block with "number or text" argument.
Then, show Ruby tab.