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

1 files changed, 2 insertions, 1 deletions

diff --git a/src/image.rs b/src/image.rs
index 5738be5f..93b95bda 100644
--- a/src/image.rs
+++ b/src/image.rs
@@ -103,7 +103,8 @@ impl ImageCache {
 }
 
 /// A unique identifier for a loaded image.
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash, Serialize, Deserialize)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+#[derive(Serialize, Deserialize)]
 pub struct ImageId(u64);
 
 impl ImageId {