new AST built with sum types

vlib/compiler2/fmt/fmt.v

@@ -0,0 +1,15 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module fmt
+
+struct Fmt {
+	// vfmt fields TODO move to a separate struct
+	// fmt_out        strings.Builder
+	fmt_lines                []string
+	// fmt_line   string
+	fmt_indent               int
+	fmt_line_empty           bool
+	// fmt_needs_nl bool
+
+}