diff --git a/crates/hir-ty/src/mir/eval/shim.rs b/crates/hir-ty/src/mir/eval/shim.rs
index bd43a62341..d76f538187 100644
--- a/crates/hir-ty/src/mir/eval/shim.rs
+++ b/crates/hir-ty/src/mir/eval/shim.rs
@@ -27,6 +27,7 @@ macro_rules! from_bytes {
     ($ty:tt, $value:expr) => {
         ($ty::from_le_bytes(match ($value).try_into() {
             Ok(it) => it,
+            #[allow(unreachable_patterns)]
             Err(_) => return Err(MirEvalError::InternalError("mismatched size".into())),
         }))
     };
diff --git a/crates/hir-ty/src/mir/lower.rs b/crates/hir-ty/src/mir/lower.rs
index 057f553380..9aa2eeebc1 100644
--- a/crates/hir-ty/src/mir/lower.rs
+++ b/crates/hir-ty/src/mir/lower.rs
@@ -1161,6 +1161,7 @@ impl<'ctx> MirLowerCtx<'ctx> {
                                     ProjectionElem::OpaqueCast(it) => {
                                         ProjectionElem::OpaqueCast(it)
                                     }
+                                    #[allow(unreachable_patterns)]
                                     ProjectionElem::Index(it) => match it {},
                                 })
                                 .collect(),