Add Value type and replace dyn-nodes with call-exprs 🏗

- In addition to syntax trees there are now `Value`s, which syntax trees can be evaluated into (e.g. the tree is `5+5` and the value is `10`)
- Parsing is completely pure, function calls are not parsed into nodes, but into simple call expressions, which are resolved later
- Functions aren't dynamic nodes anymore, but simply functions which receive their arguments as a table and the layouting context
- Functions may return any `Value`
- Layouting is powered by functions which return the new `Commands` value, which informs the layouting engine what to do
- When a function returns a non-`Commands` value, the layouter simply dumps the value into the document in monospace

1 files changed, 4 insertions, 1 deletions

diff --git a/tests/test_typeset.rs b/tests/test_typeset.rs
index 880818da..4d853393 100644
--- a/tests/test_typeset.rs
+++ b/tests/test_typeset.rs
@@ -87,7 +87,10 @@ fn test(
 
     let typeset = block_on(typesetter.typeset(src));
     let layouts = typeset.output;
-    for diagnostic in typeset.feedback.diagnostics {
+    let mut feedback = typeset.feedback;
+
+    feedback.diagnostics.sort();
+    for diagnostic in feedback.diagnostics {
         println!(
             "  {:?} {:?}: {}",
             diagnostic.v.level, diagnostic.span, diagnostic.v.message,