exec: better error message for windows LookPath

Fixes #1991.

R=golang-dev, bradfitz, rsc
CC=golang-dev
https://golang.org/cl/4648049

diff --git a/src/pkg/exec/lp_windows.go b/src/pkg/exec/lp_windows.go
index 401c693b418ea2c3dada37a520ae0c0fbc0e6b24..5a74c8ee5b435f9a8fd2eff22bb75c255524fed6 100644 (file)
--- a/src/pkg/exec/lp_windows.go
+++ b/src/pkg/exec/lp_windows.go
@@ -38,7 +38,7 @@ func findExecutable(file string, exts []string) (string, os.Error) {
                        return f, nil
                }
        }
-       return ``, ErrNotFound
+       return ``, os.ENOENT
 }
 
 func LookPath(file string) (f string, err os.Error) {