Fixed expr statements

test/src/main.ms

@@ -1,120 +1,5 @@
 import "fmt";
-import "strings";
 
-// structs are plain data
-struct Point {
-    x: float;
-    y: float;
-}
-
-// classes have fields and methods
-class Animal {
-    name: string;
-    age: int;
-
-    fn speak() -> string {
-        return "...";
-    }
-
-    fn describe() -> string {
-        return "I am " + self.name;
-    }
-}
-
-class Dog {
-    name: string;
-    age: int;
-
-    fn speak() -> string {
-        return "Woof!";
-    }
-
-    fn fetch(item: string) -> string {
-        return self.name + " fetched the " + item;
-    }
-}
-
-// basic function
-fn add(a: int, b: int) -> int {
-    return a + b;
-}
-
-// optional return type
-fn find(name: string) -> string? {
-    if name == "mist" {
-        return name;
-    }
-    return null;
-}
-
-// array types
-fn sum(numbers: [int]) -> int {
-    let total: int = 0;
-    for n in numbers {
-        total = total + n;
-    }
-    return total;
-}
-
-// multiple params, no return
-fn greet(first: string, last: string) {
-    let full: string = first + " " + last;
-    print(full);
-}
-
-// structs initialized with fields
-fn make_point(x: float, y: float) -> Point {
-    return Point {
-        x: x,
-        y: y,
-    };
-}
-
-// if / else
-fn classify(n: int) -> string {
-    if n < 0 {
-        return "negative";
-    } else {
-        return "positive";
-    }
-}
-
-// entry point
 fn main() {
-    // variables
-    let x: int = 10;
-    let y: int = 20;
-    let result: int = add(x, y);
-
-    // inferred (no type annotation)
-    let message = "Hello from Mist!";
-    print(message);
-
-    // struct usage
-    let p: Point = make_point(1.5, 2.5);
-    print(p.x);
-
-    // class usage
-    let dog: Dog = Dog {
-        name: "Rex",
-        age: 3,
-    };
-    print(dog.speak());
-    print(dog.fetch("ball"));
-
-    // arrays
-    let nums: [int] = [1, 2, 3, 4, 5];
-    let total: int = sum(nums);
-    print(total);
-
-    // for loop
-    for n in nums {
-        print(n);
-    }
-
-    // optional
-    let found: string? = find("mist");
-    if found {
-        print(found);
-    }
-}
+    fmt.Println("Hello World!");
+}