[FIXED] What is this "err.(*exec.ExitError)" thing in Go code?

Issue

For instance, in this answer:

https://stackoverflow.com/a/10385867/20654

...
if exiterr, ok := err.(*exec.ExitError); ok {
...

What is that err.(*exec.ExitError) called? How does it work?

Solution

It's type assertion. I can't explain it better than the spec.

Answered By - Mostafa

Answer Checked By - Senaida (PHPFixing Volunteer)