fixed inconsistent indentation in book example

looks like a case of mixed tabs and spaces

diff --git a/src/doc/book/error-handling.md b/src/doc/book/error-handling.md
index 600019bcceb0acff928d1267408554b82d9ff5f8..e37360a457b7b6bd5a1937fc42c5815a5a7d499d 100644 (file)
--- a/src/doc/book/error-handling.md
+++ b/src/doc/book/error-handling.md
@@ -1643,7 +1643,7 @@ fn main() {
 
     let matches = match opts.parse(&args[1..]) {
         Ok(m)  => { m }
-               Err(e) => { panic!(e.to_string()) }
+        Err(e) => { panic!(e.to_string()) }
     };
 
     if matches.opt_present("h") {