+warning: captured variable cannot escape `FnMut` closure body
+ --> $DIR/issue-49824.rs:10:9
+ |
+LL | || {
+ | - inferred to be a `FnMut` closure
+LL | / || {
+LL | |
+LL | |
+LL | |
+LL | | let _y = &mut x;
+LL | | }
+ | |_________^ returns a closure that contains a reference to a captured variable, which then escapes the closure body
+ |
+ = note: `FnMut` closures only have access to their captured variables while they are executing...
+ = note: ...therefore, they cannot allow references to captured variables to escape
+ = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
+ = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
+ = note: for more information, try `rustc --explain E0729`
+
error: compilation successful
- --> $DIR/issue-49824.rs:8:1
+ --> $DIR/issue-49824.rs:6:1
|
LL | / fn main() {
LL | |