feat: 管道 |> + 字符串插值 \(expr) — P0 四特性收官

test/programs/28_pipe.l

@@ -0,0 +1,14 @@
+fn double(x: i64) -> i64 {
+    return x * 2;
+}
+
+fn add(a: i64, b: i64) -> i64 {
+    return a + b;
+}
+
+fn main() -> i64 {
+    // 管道: 10 |> double() |> add(5)  →  add(double(10), 5) = 25
+    let result = 10 |> double() |> add(5);
+    print_i64(result);  // 25
+    return 0;
+}

test/programs/29_interp.l

@@ -0,0 +1,6 @@
+fn main() -> i64 {
+    let name = "World";
+    let greeting = "Hello, \(name)!";
+    print_str(greeting);  // "Hello, World!"
+    return 0;
+}