Use a type implementing Drop

czipperz · czipperz · commit fea2cdb0a48e · 2019-06-02T19:11:39.000-07:00
diff --git a/src/test/ui/nll/issue-61424.rs b/src/test/ui/nll/issue-61424.rs
@@ -2,6 +2,6 @@
 
 fn main() {
     let mut x; //~ ERROR: variable does not need to be mutable
-    x = 0;
-    dbg!(0);
+    x = String::new();
+    dbg!(x);
 }
diff --git a/src/test/ui/nll/issue-61424.stderr b/src/test/ui/nll/issue-61424.stderr
@@ -0,0 +1,16 @@
+error: variable does not need to be mutable
+  --> $DIR/issue-61424.rs:4:9
+   |
+LL |     let mut x;
+   |         ----^
+   |         |
+   |         help: remove this `mut`
+   |
+note: lint level defined here
+  --> $DIR/issue-61424.rs:1:9
+   |
+LL | #![deny(unused_mut)]
+   |         ^^^^^^^^^^
+
+error: aborting due to previous error
+

Original file line number	Diff line number	Diff line change
`@@ -2,6 +2,6 @@`
`2`	`2`
`3`	`3`	`fn main() {`
`4`	`4`	`let mut x; //~ ERROR: variable does not need to be mutable`
`5`		`- x = 0;`
`6`		`- dbg!(0);`
	`5`	`+ x = String::new();`
	`6`	`+ dbg!(x);`
`7`	`7`	`}`