runtime: make it clear that Goexit cannot be recover'd.
LGTM=r
R=r, bradfitz, khr
CC=golang-codereviews
https://golang.org/cl/136660044
diff --git a/src/runtime/panic.go b/src/runtime/panic.go
index 12c85e7..927b6db4 100644
--- a/src/runtime/panic.go
+++ b/src/runtime/panic.go
@@ -238,7 +238,8 @@
}
// Goexit terminates the goroutine that calls it. No other goroutine is affected.
-// Goexit runs all deferred calls before terminating the goroutine.
+// Goexit runs all deferred calls before terminating the goroutine. Because Goexit
+// is not panic, however, any recover calls in those deferred functions will return nil.
//
// Calling Goexit from the main goroutine terminates that goroutine
// without func main returning. Since func main has not returned,
