关于变量的设计 草案1

格式 <表示格式> 实际代码不需要<>
```js
var <变量名> = <值>
```
调用函数后的返回值
```js
var fruitName = "apple"
changeFruitName("banana") -> a
print a
//a is "banana" now
```

The issue describes a design draft for variable assignment and function return value handling in a simple language. Start by examining the existing language implementation in the repository to understand the current syntax and semantics. Look for files related to parsing, evaluation, and variable binding. Determine how to modify the grammar and interpreter to support the proposed syntax where a function call's return value can be assigned implicitly. Testing changes will require updating or creating test cases for the new behavior.

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