Pretty print literals partially

src/pretty.rs

@@ -1,3 +1,4 @@
 mod basic;
 mod expr;
+mod lit;
 mod program;

src/pretty/expr.rs

@@ -5,7 +5,7 @@ use crate::ast::Expr;
 impl<'a, D: DocAllocator<'a>> Pretty<'a, D> for Expr {
     fn pretty(self, allocator: &'a D) -> DocBuilder<'a, D> {
         match self {
-            Self::Lit(lit) => allocator.text("<lit>"),
+            Self::Lit(lit) => lit.pretty(allocator),
             Self::Call(call) => allocator.text("<call>"),
             Self::Field(field) => allocator.text("<field>"),
             Self::Var(var) => allocator.text("<var>"),

src/pretty/lit.rs

@@ -0,0 +1,17 @@
+use pretty::{DocAllocator, DocBuilder, Pretty};
+
+use crate::ast::Lit;
+
+impl<'a, D: DocAllocator<'a>> Pretty<'a, D> for Lit {
+    fn pretty(self, allocator: &'a D) -> DocBuilder<'a, D> {
+        match self {
+            Self::Nil(_) => allocator.text("nil"),
+            Self::Bool(false, _) => allocator.text("false"),
+            Self::Bool(true, _) => allocator.text("true"),
+            Self::Builtin(builtin, _) => allocator.text(format!("{builtin:?}")),
+            Self::Num(num) => allocator.text("<num>"),
+            Self::String(string) => allocator.text("<string>"),
+            Self::Table(table) => allocator.text("<table>"),
+        }
+    }
+}