mruby/mruby — pull request #526 by skandhas (2012-11-02 07:07:02+00:00)
Title: delete needless output in String#[]=

There is needless output in String#[]= .

Example:
```ruby
s = "abcd"
s[0]= "X"

p s
```
mruby output:
```ruby
"Xbcd"
"Xbcd"
```