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-rw-r--r--tvix/eval/src/errors.rs7
1 files changed, 6 insertions, 1 deletions
diff --git a/tvix/eval/src/errors.rs b/tvix/eval/src/errors.rs
index 14f6819862b1..3df51acb6ca6 100644
--- a/tvix/eval/src/errors.rs
+++ b/tvix/eval/src/errors.rs
@@ -1,7 +1,12 @@
 use std::fmt::Display;
 
 #[derive(Debug)]
-pub struct Error {}
+pub enum Error {
+    TypeError {
+        expected: &'static str,
+        actual: &'static str,
+    },
+}
 
 impl Display for Error {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {