error[E0503]: cannot use `self.width` because it was mutably borrowed --> $DIR/issue-25793.rs:4:9 | LL | $this.width.unwrap() | ^^^^^^^^^^^ use of borrowed `*self` ... LL | let r = &mut *self; | ---------- `*self` is borrowed here LL | r.get_size(width!(self)) | -------- ------------ in this macro invocation | | | borrow later used by call | = note: this error originates in the macro `width` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to previous error For more information about this error, try `rustc --explain E0503`.