mruby/mruby — pull request #2060 by cremno (2014-04-14 01:59:46+00:00)
Title: exc_inspect: dup file and check mesg only once

```ruby
begin
fail ArgumentError, 'wrong number of arguments'
rescue => e
p e, e
end
```
```bash
test.rb:2: undefined method 'fail' for main (NoMethodError)
test.rb:2: undefined method 'fail' for main (NoMethodError):2: undefined method
'fail' for main (NoMethodError)
```