Variable Shadowing
In Rhai, new variables automatically shadow existing ones of the same name. There is no error.
This behavior is consistent with Rust.
let x = 42;
let y = 123;
print(x); // prints 42
let x = 88; // <- 'x' is shadowed here
// At this point, it is no longer possible to access the
// original 'x' on the first line...
print(x); // prints 88
let x = 0; // <- 'x' is shadowed again
// At this point, it is no longer possible to access both
// previously-defined 'x'...
print(x); // prints 0
{
let x = 999; // <- 'x' is shadowed in a block
print(x); // prints 999
}
print(x); // prints 0 - shadowing within the block goes away
print(y); // prints 123 - 'y' is not shadowed
Set [`Engine::set_allow_shadowing`][options] to `false` to turn [variables] shadowing off.
```rust
let x = 42;
let x = 123; // <- syntax error: variable 'x' already defined
// when variables shadowing is disallowed
```