occur name error if procedure argument first letter is uppercase

### Expected Behavior

code -> ruby

```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.
