fmt code

ch7/ch7-08.md

@@ -4,7 +4,7 @@
 
 ```go
 type error interface {
-    Error() string
+	Error() string
 }
 ```
 
@@ -46,17 +46,17 @@ package syscall
 type Errno uintptr // operating system error code
 
 var errors = [...]string{
-    1:   "operation not permitted",   // EPERM
-    2:   "no such file or directory", // ENOENT
-    3:   "no such process",           // ESRCH
-    // ...
+	1:   "operation not permitted",   // EPERM
+	2:   "no such file or directory", // ENOENT
+	3:   "no such process",           // ESRCH
+	// ...
 }
 
 func (e Errno) Error() string {
-    if 0 <= int(e) && int(e) < len(errors) {
-        return errors[e]
-    }
-    return fmt.Sprintf("errno %d", e)
+	if 0 <= int(e) && int(e) < len(errors) {
+		return errors[e]
+	}
+	return fmt.Sprintf("errno %d", e)
 }
 ```