Assignments

Value assignments to variables use the = symbol.

let foo = 42;

bar = 123 * 456 - 789;

x[1][2].prop = do_calculation();

The left-hand-side (LHS) of an assignment statement must be a valid l-value, which must be rooted in a variable, potentially extended via indexing or properties.

Expressions that are not valid _l-values_ cannot be assigned to.

```rust
x = 42;                 // variable is an l-value

x[1][2][3] = 42         // variable indexing is an l-value

x.prop1.prop2 = 42;     // variable property is an l-value

foo(x) = 42;            // syntax error: function call is not an l-value

x.foo() = 42;           // syntax error: method call is not an l-value

(x + y) = 42;           // syntax error: binary expression is not an l-value
```