1 An assignment operator was used on a non-place expression.
3 Erroneous code examples:
11 const SOME_CONST: i32 = 12;
13 fn some_other_func() {}
16 SOME_CONST = 14; // error: a constant value cannot be changed!
17 1 = 3; // error: 1 isn't a valid place!
18 some_other_func() = 4; // error: we cannot assign value to a function!
19 SomeStruct::x = 12; // error: SomeStruct a structure name but it is used
24 The left-hand side of an assignment operator must be a place expression. A
25 place expression represents a memory location and can be a variable (with
26 optional namespacing), a dereference, an indexing expression or a field
29 More details can be found in the [Expressions] section of the Reference.
31 [Expressions]: https://doc.rust-lang.org/reference/expressions.html#places-rvalues-and-temporaries
33 And now let's give working examples:
40 let mut s = SomeStruct { x: 0, y: 0 };
42 s.x = 3; // that's good !
46 fn some_func(x: &mut i32) {
47 *x = 12; // that's good !