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// 函数声明
fn func_name(arg1: arg1_type) -> {
    // func_body
}

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let m = 1.0;
let c = 2.0;

let line = |x| m*x + c;

// 等价于
struct SomeUnknownType<'a> {
    m: &'a f64,
    c: &'a f64
}
impl<'a> SomeUnknownType<'a> {
    fn call(&self, x: f64) -> f64 {
        self.m * x + self.c
    }
}