New macro system and stdlib additions

orchid-api/src/tree.rs

@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::fmt;
 use std::num::NonZeroU64;
 use std::ops::Range;
 use std::rc::Rc;
@@ -56,6 +57,15 @@ pub enum Paren {
 	Square,
 	Curly,
 }
+impl fmt::Display for Paren {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		write!(f, "{}", match self {
+			Self::Round => "()",
+			Self::Curly => "{}",
+			Self::Square => "[]",
+		})
+	}
+}
 
 #[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, PartialOrd, Ord, Coding)]
 pub struct TreeId(pub NonZeroU64);