Method declare_variable

aiscript-vm/src/compiler/codegen.rs:1764–1782

(&mut self, name: Token<'gc>, mutability: Mutability)

    }

    fn declare_variable(&mut self, name: Token<'gc>, mutability: Mutability) -> usize {
        if self.scope_depth == 0 {
            return 0;
        }

        for i in (0..self.local_count).rev() {
            let local = &self.locals[i];
            if local.is_initialized() && local.depth < self.scope_depth {
                // Stop when we reach an outer scope
                break;
            }
            if local.name.lexeme == name.lexeme {
                self.error_at(name, "Already a variable with this name in this scope.");
                // return;
            }
        }

        self.add_local(name, mutability)
    }

    fn update_top_local_name(&mut self, name: Token<'gc>) {
        self.locals[self.local_count - 1].name = name;