error[E0499]: cannot borrow `x` as mutable more than once at a time --> $DIR/borrowck-describe-lvalue.rs:262:13 | LL | let y = &mut x; | ------ first mutable borrow occurs here LL | &mut x; | ^^^^^^ second mutable borrow occurs here LL | *y = 1; | ------ first borrow later used here error[E0499]: cannot borrow `x` as mutable more than once at a time --> $DIR/borrowck-describe-lvalue.rs:272:20 | LL | let y = &mut x; | ------ first mutable borrow occurs here LL | &mut x; | ^^^^^^ second mutable borrow occurs here LL | *y = 1; | ------ first borrow later used here error: captured variable cannot escape `FnMut` closure body --> $DIR/borrowck-describe-lvalue.rs:270:16 | LL | || { | - inferred to be a `FnMut` closure LL | / || { LL | | let y = &mut x; LL | | &mut x; LL | | *y = 1; LL | | drop(y); 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 error[E0503]: cannot use `f.x` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:41:9 | LL | let x = f.x(); | - borrow of `f` occurs here LL | f.x; | ^^^ use of borrowed `f` LL | drop(x); | - borrow later used here error[E0503]: cannot use `g.0` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:48:9 | LL | let x = g.x(); | - borrow of `g` occurs here LL | g.0; | ^^^ use of borrowed `g` LL | drop(x); | - borrow later used here error[E0503]: cannot use `h.0` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:55:9 | LL | let x = &mut h.0; | -------- borrow of `h.0` occurs here LL | h.0; | ^^^ use of borrowed `h.0` LL | drop(x); | - borrow later used here error[E0503]: cannot use `e.0` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:63:20 | LL | let x = e.x(); | - borrow of `e` occurs here LL | match e { LL | Baz::X(value) => value | ^^^^^ use of borrowed `e` LL | }; LL | drop(x); | - borrow later used here error[E0503]: cannot use `u.a` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:71:9 | LL | let x = &mut u.a; | -------- borrow of `u.a` occurs here LL | u.a; | ^^^ use of borrowed `u.a` LL | drop(x); | - borrow later used here error[E0503]: cannot use `f.x` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:78:9 | LL | let x = f.x(); | - borrow of `*f` occurs here LL | f.x; | ^^^ use of borrowed `*f` LL | drop(x); | - borrow later used here error[E0503]: cannot use `g.0` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:85:9 | LL | let x = g.x(); | - borrow of `*g` occurs here LL | g.0; | ^^^ use of borrowed `*g` LL | drop(x); | - borrow later used here error[E0503]: cannot use `h.0` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:92:9 | LL | let x = &mut h.0; | -------- borrow of `h.0` occurs here LL | h.0; | ^^^ use of borrowed `h.0` LL | drop(x); | - borrow later used here error[E0503]: cannot use `e.0` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:100:20 | LL | let x = e.x(); | - borrow of `*e` occurs here LL | match *e { LL | Baz::X(value) => value | ^^^^^ use of borrowed `*e` ... LL | drop(x); | - borrow later used here error[E0503]: cannot use `u.a` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:109:9 | LL | let x = &mut u.a; | -------- borrow of `u.a` occurs here LL | u.a; | ^^^ use of borrowed `u.a` LL | drop(x); | - borrow later used here error[E0503]: cannot use `v[..]` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:117:15 | LL | let x = &mut v; | ------ borrow of `v` occurs here LL | match v { LL | &[x, _, .., _, _] => println!("{}", x), | ^ use of borrowed `v` ... LL | drop(x); | - borrow later used here error[E0503]: cannot use `v[..]` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:122:18 | LL | let x = &mut v; | ------ borrow of `v` occurs here ... LL | &[_, x, .., _, _] => println!("{}", x), | ^ use of borrowed `v` ... LL | drop(x); | - borrow later used here error[E0503]: cannot use `v[..]` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:127:25 | LL | let x = &mut v; | ------ borrow of `v` occurs here ... LL | &[_, _, .., x, _] => println!("{}", x), | ^ use of borrowed `v` ... LL | drop(x); | - borrow later used here error[E0503]: cannot use `v[..]` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:132:28 | LL | let x = &mut v; | ------ borrow of `v` occurs here ... LL | &[_, _, .., _, x] => println!("{}", x), | ^ use of borrowed `v` ... LL | drop(x); | - borrow later used here error[E0503]: cannot use `v[..]` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:143:15 | LL | let x = &mut v; | ------ borrow of `v` occurs here LL | match v { LL | &[x..] => println!("{:?}", x), | ^ use of borrowed `v` ... LL | drop(x); | - borrow later used here error[E0503]: cannot use `v[..]` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:148:18 | LL | let x = &mut v; | ------ borrow of `v` occurs here ... LL | &[_, x..] => println!("{:?}", x), | ^ use of borrowed `v` ... LL | drop(x); | - borrow later used here error[E0503]: cannot use `v[..]` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:153:15 | LL | let x = &mut v; | ------ borrow of `v` occurs here ... LL | &[x.., _] => println!("{:?}", x), | ^ use of borrowed `v` ... LL | drop(x); | - borrow later used here error[E0503]: cannot use `v[..]` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:158:18 | LL | let x = &mut v; | ------ borrow of `v` occurs here ... LL | &[_, x.., _] => println!("{:?}", x), | ^ use of borrowed `v` ... LL | drop(x); | - borrow later used here error[E0503]: cannot use `e` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:171:13 | LL | let x = &mut e; | ------ borrow of `e` occurs here LL | match e { LL | E::A(ref ax) => | ^^^^^^^^^^^^ use of borrowed `e` ... LL | drop(x); | - borrow later used here error[E0502]: cannot borrow `e.0` as immutable because it is also borrowed as mutable --> $DIR/borrowck-describe-lvalue.rs:171:18 | LL | let x = &mut e; | ------ mutable borrow occurs here LL | match e { LL | E::A(ref ax) => | ^^^^^^ immutable borrow occurs here ... LL | drop(x); | - mutable borrow later used here error[E0502]: cannot borrow `e.x` as immutable because it is also borrowed as mutable --> $DIR/borrowck-describe-lvalue.rs:175:23 | LL | let x = &mut e; | ------ mutable borrow occurs here ... LL | E::B { x: ref bx } => | ^^^^^^ immutable borrow occurs here ... LL | drop(x); | - mutable borrow later used here error[E0502]: cannot borrow `s.y.0` as immutable because it is also borrowed as mutable --> $DIR/borrowck-describe-lvalue.rs:188:22 | LL | let x = &mut s; | ------ mutable borrow occurs here LL | match s { LL | S { y: (ref y0, _), .. } => | ^^^^^^ immutable borrow occurs here ... LL | drop(x); | - mutable borrow later used here error[E0502]: cannot borrow `s.x.y` as immutable because it is also borrowed as mutable --> $DIR/borrowck-describe-lvalue.rs:194:28 | LL | let x = &mut s; | ------ mutable borrow occurs here ... LL | S { x: F { y: ref x0, .. }, .. } => | ^^^^^^ immutable borrow occurs here ... LL | drop(x); | - mutable borrow later used here error[E0503]: cannot use `*v` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:240:9 | LL | let x = &mut v; | ------ borrow of `v` occurs here LL | v[0].y; | ^^^^ use of borrowed `v` ... LL | drop(x); | - borrow later used here error[E0503]: cannot use `v[_].y` because it was mutably borrowed --> $DIR/borrowck-describe-lvalue.rs:240:9 | LL | let x = &mut v; | ------ borrow of `v` occurs here LL | v[0].y; | ^^^^^^ use of borrowed `v` ... LL | drop(x); | - borrow later used here error[E0502]: cannot borrow `v[..].x` as immutable because it is also borrowed as mutable --> $DIR/borrowck-describe-lvalue.rs:251:24 | LL | let x = &mut v; | ------ mutable borrow occurs here LL | match v { LL | &[_, F {x: ref xf, ..}] => println!("{}", xf), | ^^^^^^ immutable borrow occurs here ... LL | drop(x); | - mutable borrow later used here warning[E0502]: cannot borrow `*block.current` as immutable because it is also borrowed as mutable --> $DIR/borrowck-describe-lvalue.rs:210:29 | LL | let x = &mut block; | ---------- mutable borrow occurs here LL | let p: &'a u8 = &*block.current; | ^^^^^^^^^^^^^^^ immutable borrow occurs here ... LL | drop(x); | - mutable borrow later used here | = 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 warning[E0502]: cannot borrow `*block.current` as immutable because it is also borrowed as mutable --> $DIR/borrowck-describe-lvalue.rs:227:33 | LL | let x = &mut block; | ---------- mutable borrow occurs here LL | let p : *const u8 = &*(*block).current; | ^^^^^^^^^^^^^^^^^^ immutable borrow occurs here ... LL | drop(x); | - mutable borrow later used here | = 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 error[E0382]: use of moved value: `x` --> $DIR/borrowck-describe-lvalue.rs:282:22 | LL | drop(x); | - value moved here LL | drop(x); | ^ value used here after move | = note: move occurs because `x` has type `std::vec::Vec`, which does not implement the `Copy` trait error: aborting due to 30 previous errors Some errors have detailed explanations: E0382, E0499, E0502, E0503. For more information about an error, try `rustc --explain E0382`.