The first line of the comment in examples must be:

```go
// Output:
```

I've changed that locally and the examples fail because of various formatting differences, ordering of the fields and etc. You might want to find another way to test that =)

To know that the examples weren't running, you can run `go test` with the verbose flag: 

```bash
Sirupsen/logrus $ go test . -v
testing: warning: no tests to run
PASS
ok  	github.com/Sirupsen/logrus	0.011s
```
After adding the line:
``` bash
Sirupsen/logrus $ go test . -v
=== RUN: ExampleLogger_Info
--- FAIL: ExampleLogger_Info (154.257us)
# ... stuff
```