```
"##,
+E0506: r##"
+This error occurs when an attempt is made to assign to a borrowed value.
+
+Example of erroneous code:
+
+```compile_fail
+struct FancyNum {
+ num: u8
+}
+
+fn main() {
+ let mut fancy_num = FancyNum { num: 5 };
+ let fancy_ref = &fancy_num;
+ fancy_num = FancyNum { num: 6 };
+ // error: cannot assign to `fancy_num` because it is borrowed
+
+ println!("Num: {}, Ref: {}", fancy_num.num, fancy_ref.num);
+}
+```
+
+Because `fancy_ref` still holds a reference to `fancy_num`, `fancy_num` can't
+be assigned to a new value as it would invalidate the reference.
+
+Alternatively, we can move out of `fancy_num` into a second `fancy_num`:
+
+```
+struct FancyNum {
+ num: u8
+}
+
+fn main() {
+ let mut fancy_num = FancyNum { num: 5 };
+ let moved_num = fancy_num;
+ fancy_num = FancyNum { num: 6 };
+
+ println!("Num: {}, Moved num: {}", fancy_num.num, moved_num.num);
+}
+```
+
+If the value has to be borrowed, try limiting the lifetime of the borrow using
+a scoped block:
+
+```
+struct FancyNum {
+ num: u8
+}
+
+fn main() {
+ let mut fancy_num = FancyNum { num: 5 };
+
+ {
+ let fancy_ref = &fancy_num;
+ println!("Ref: {}", fancy_ref.num);
+ }
+
+ // Works because `fancy_ref` is no longer in scope
+ fancy_num = FancyNum { num: 6 };
+ println!("Num: {}", fancy_num.num);
+}
+```
+
+Or by moving the reference into a function:
+
+```
+struct FancyNum {
+ num: u8
+}
+
+fn main() {
+ let mut fancy_num = FancyNum { num: 5 };
+
+ print_fancy_ref(&fancy_num);
+
+ // Works because function borrow has ended
+ fancy_num = FancyNum { num: 6 };
+ println!("Num: {}", fancy_num.num);
+}
+
+fn print_fancy_ref(fancy_ref: &FancyNum){
+ println!("Ref: {}", fancy_ref.num);
+}
+```
+"##,
+
E0507: r##"
You tried to move out of a value which was borrowed. Erroneous code example:
E0503, // cannot use `..` because it was mutably borrowed
E0504, // cannot move `..` into closure because it is borrowed
E0505, // cannot move out of `..` because it is borrowed
- E0506, // cannot assign to `..` because it is borrowed
E0508, // cannot move out of type `..`, a non-copy fixed-size array
E0509, // cannot move out of type `..`, which defines the `Drop` trait
E0524, // two closures require unique access to `..` at the same time