ast: add stmt printing

src/ast.zig

@@ -142,7 +142,28 @@ pub fn printNode(node: *Node, ident: usize) void {
             }
         },
 
-        .Expr => |expr| printExpr(expr),
+        .Expr => |expr| {
+            printIdent(ident);
+            printExpr(expr);
+            std.debug.warn("\n");
+        },
+
+        .Stmt => |stmt| blk: {
+            switch (stmt.*) {
+                .Println => |expr| blk2: {
+                    printIdent(ident);
+                    std.debug.warn("println(");
+                    printExpr(expr);
+                    std.debug.warn("\n");
+                },
+
+                .Expr => |expr| {
+                    printIdent(ident);
+                    printExpr(expr);
+                    std.debug.warn("\n");
+                },
+            }
+        },
 
         else => {
             print(ident, "unknown node: {}\n", node);