1 files changed, 10 insertions, 0 deletions
diff --git a/compiler/rustc_hir/src/errors.rs b/compiler/rustc_hir/src/errors.rs
new file mode 100644
index 000000000..e593ed104
--- /dev/null
+++ b/compiler/rustc_hir/src/errors.rs
@@ -0,0 +1,10 @@
+use crate::LangItem;
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, Encodable, Decodable)]
+pub struct LangItemError(pub LangItem);
+
+impl ToString for LangItemError {
+    fn to_string(&self) -> String {
+        format!("requires `{}` lang_item", self.0.name())
+    }
+}