Add test marks

crates/ra_hir/src/marks.rs

@@ -11,4 +11,9 @@ test_utils::marks!(
     match_ergonomics_ref
     trait_resolution_on_fn_type
     infer_while_let
+    match_complex_arm_ty
+    match_first_arm_never
+    match_second_arm_never
+    match_all_arms_never
+    match_no_never_arms
 );

crates/ra_hir/src/ty/infer.rs

@@ -1096,8 +1096,10 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
                     }
                     let arm_ty = self.infer_expr(arm.expr, &expected);
                     if all_arms_never && Self::is_never(&arm_ty) {
+                        tested_by!(match_first_arm_never);
                         resulting_match_ty = Some(arm_ty);
                     } else {
+                        tested_by!(match_second_arm_never);
                         all_arms_never = false;
                         resulting_match_ty = None;
                     }
@@ -1106,10 +1108,13 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
                 if let (Ty::Infer(expected_tv), Some(match_ty)) =
                     (&expected.ty, &resulting_match_ty)
                 {
+                    tested_by!(match_all_arms_never);
                     self.var_unification_table
                         .union_value(expected_tv.to_inner(), TypeVarValue::Known(match_ty.clone()));
                     match_ty.clone()
                 } else {
+                    tested_by!(match_no_never_arms);
+                    tested_by!(match_complex_arm_ty);
                     expected.ty
                 }
             }

crates/ra_hir/src/ty/tests.rs

@@ -3595,12 +3595,13 @@ fn no_such_field_diagnostics() {
     );
 }
 
-#[cfg(test)]
 mod match_with_never_tests {
     use super::type_at;
+    use test_utils::covers;
 
     #[test]
     fn match_complex_arm_ty() {
+        covers!(match_complex_arm_ty);
         let t = type_at(
             r#"
 //- /main.rs
@@ -3624,6 +3625,7 @@ fn test(a: i32) {
 
     #[test]
     fn match_first_arm_never() {
+        covers!(match_first_arm_never);
         let t = type_at(
             r#"
 //- /main.rs
@@ -3644,6 +3646,7 @@ fn test(a: i32) {
 
     #[test]
     fn match_second_arm_never() {
+        covers!(match_second_arm_never);
         let t = type_at(
             r#"
 //- /main.rs
@@ -3664,6 +3667,7 @@ fn test(a: i32) {
 
     #[test]
     fn match_all_arms_never() {
+        covers!(match_all_arms_never);
         let t = type_at(
             r#"
 //- /main.rs
@@ -3682,6 +3686,7 @@ fn test(a: i32) {
 
     #[test]
     fn match_no_never_arms() {
+        covers!(match_no_never_arms);
         let t = type_at(
             r#"
 //- /main.rs