No warning or error when defining a variable multiple times in the same scope

[jasal82]

Observed behavior

fn foo() {
  let var = 1;
  var = 2; // OK
  let var = 3; // OK

fn bar(param) {
  param = 1; // OK
  let param = 2; // OK
}

Expected behavior

fn foo() {
  let var = 1;
  var = 2; // OK
  let var = 3; // should fail
}

fn bar(param) {
  param = 1; // OK
  let param = 2; // should at least warn
}

[udoprog]

This is expected, since we've adopted the variable shadowing rules from Rust.

See playground.

Some of the unused warnings could be adopted though.

[jasal82]

That would help a bit I guess. As a C++ programmer I find the shadowing rules irritating enough in Rust, but what makes it worse in Rune is the combination with dynamic typing.