occur name error if procedure argument first letter is uppercase

[takaokouji]

Expected Behavior

code -> ruby

def self.procedure(aRG1)
  move(aRG1)
end

Actual Behavior

def self.procedure(aRG1)
  move(ARG1)
end

First letter is still uppercase.

Steps to Reproduce

Defined procedure with ARG1. After that, you click Ruby tab.