ast printing

examples/call.rs

@@ -2,6 +2,6 @@ fn f(x: i32, y: i32) -> i32 {
     3 + 5 + x + y
 }
 
-fn main() -> i32 {
-    f(1, 2)
+fn main() {
+    f(1, 2);
 }

examples/ref2.rs

 fn main() {
     let mut a = 1;
     let b = &mut a;
-    let c = b;
+    let c: &mut i32 = b;
 }

src/ast.rs

@@ -233,10 +233,12 @@ impl Stmt {
         match self {
             // Id mut? (: Type)? (= Expr)?
             Stmt::Let(id, m, ot, oe) => {
-                write!(fmt, "let {}", id)?;
+                write!(fmt, "let ")?;
                 if *m {
                     write!(fmt, "mut ")?;
                 }
+                write!(fmt, "{}", id)?;
+
                 if let Some(t) = ot {
                     write!(fmt, ": {}", t)?;
                 }