rails/rails — pull request #7084 by LTe (2012-07-18 07:49:54+00:00)
Title: Don't use default separator in tagged logger

When the default separator is set logger will create incorrect output

```ruby
$, = "_"
@logger.tagged("BCX", "BDX") { @logger.info "Funky time" }
# => [BCX] _[BDX] Funky time
```