Fatal errors

- Makes errors fatal, so that a phase is only reached when all previous phases were error-free
- Parsing still recovers and can produce multiple errors
- Evaluation fails fast and can thus produce only a single error (except for parse errors due to an import)
- The single error that could occur during execution is removed for now
- Removes Value::Error variant

2 files changed, 2 insertions, 4 deletions

diff --git a/src/syntax/node.rs b/src/syntax/node.rs
index 9294fecd..881752a6 100644
--- a/src/syntax/node.rs
+++ b/src/syntax/node.rs
@@ -1,5 +1,3 @@
-use std::rc::Rc;
-
 use super::*;
 
 /// A syntax node, encompassing a single logical entity of parsed source code.
@@ -52,7 +50,7 @@ pub struct HeadingNode {
     /// The section depth (numer of equals signs).
     pub level: usize,
     /// The contents of the heading.
-    pub body: Rc<SyntaxTree>,
+    pub body: SyntaxTree,
 }
 
 /// An item in an unordered list: `- ...`.
diff --git a/src/syntax/visit.rs b/src/syntax/visit.rs
index b6ee657a..c38e87aa 100644
--- a/src/syntax/visit.rs
+++ b/src/syntax/visit.rs
@@ -102,7 +102,7 @@ impl_visitors! {
     }
 
     visit_heading(v, heading: HeadingNode) {
-        v.visit_tree(r!(rc: heading.body));
+        v.visit_tree(r!(heading.body));
     }
 
     visit_list(v, item: ListItem) {