remove Stmt as an AST node

it was only used for printing purposes, even though we can use the
existing printStmt() function.

src/ast.zig

@@ -18,7 +18,6 @@ pub const NodeType = enum {
     Struct,
     Enum,
     Block,
-    Stmt,
 };
 
 pub const ParamDecl = struct {
@@ -323,8 +322,6 @@ pub const Node = union(NodeType) {
 
     Block: StmtList,
 
-    Stmt: *Stmt,
-
     pub fn mkRoot(allocator: *std.mem.Allocator) !*Node {
         var node = try allocator.create(Node);
         node.* = Node{ .Root = NodeList.init(allocator) };

src/ast_printer.zig

@@ -99,12 +99,6 @@ pub fn printNode(node: *const Node, ident: usize) void {
             }
         },
 
-        .Stmt => |stmt| {
-            printIdent(ident);
-            printStmt(ident, stmt);
-            std.debug.warn("\n");
-        },
-
         .Struct => |struc| {
             print(ident, "(struct {} (\n", struc.name.lexeme);
             for (struc.fields.toSlice()) |field| {

src/parsers.zig

@@ -236,12 +236,6 @@ pub const Parser = struct {
         return node;
     }
 
-    fn mkStmt(self: *Parser, stmt: *Stmt) !*ast.Node {
-        var node = try self.allocator.create(Node);
-        node.* = Node{ .Stmt = stmt };
-        return node;
-    }
-
     fn mkStmtExpr(self: *Parser, expr: *Expr) !*Stmt {
         var stmt = try self.allocator.create(Stmt);
         stmt.* = Stmt{ .Expr = expr };
@@ -634,7 +628,8 @@ pub const Parser = struct {
 
         while (self.peek().typ != .RightBrace) {
             var stmt = try self.parseStmt();
-            printer.printNode(try self.mkStmt(stmt), 0);
+            printer.printStmt(0, stmt);
+
             if (self.check(.Semicolon))
                 _ = try self.consumeSingle(.Semicolon);
             try stmts.append(stmt.*);