error[E0515]: cannot return reference to temporary value --> $DIR/issue-17718-constants-not-static.rs:5:30 | LL | fn foo() -> &'static usize { &id(FOO) } | ^------- | || | |temporary value created here | returns a reference to data owned by the current function error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0515`.