Remove unneeded mut modifier in test (#534)

vabc3 · Michael-F-Bryan · commit fd8f3bb415df · 2018-01-08T00:25:45.000+08:00
diff --git a/tests/rendered_output.rs b/tests/rendered_output.rs
@@ -317,7 +317,7 @@ fn book_with_a_reserved_filename_does_not_build() {
     let mut summary_file = fs::File::create(summary_path).unwrap();
     writeln!(summary_file, "[print](print.md)").unwrap();
 
-    let mut md = MDBook::load(tmp_dir.path()).unwrap();
+    let md = MDBook::load(tmp_dir.path()).unwrap();
     let got = md.build();
     assert!(got.is_err());
 }

Original file line number	Diff line number	Diff line change
`@@ -317,7 +317,7 @@ fn book_with_a_reserved_filename_does_not_build() {`
`317`	`317`	`let mut summary_file = fs::File::create(summary_path).unwrap();`
`318`	`318`	`writeln!(summary_file, "[print](print.md)").unwrap();`
`319`	`319`
`320`		`- let mut md = MDBook::load(tmp_dir.path()).unwrap();`
	`320`	`+ let md = MDBook::load(tmp_dir.path()).unwrap();`
`321`	`321`	`let got = md.build();`
`322`	`322`	`assert!(got.is_err());`
`323`	`323`	`}`