minor: put a mark back

Author: matklad

crates/hir_ty/src/diagnostics/match_check/deconstruct_pat.rs

@@ -664,6 +664,7 @@ impl Fields {
                         let is_non_exhaustive =
                             is_field_list_non_exhaustive(variant_id, cx) && !adt_is_local;
 
+                        cov_mark::hit!(match_check_wildcard_expanded_to_substitutions);
                         let field_ty_data = cx.db.field_types(variant_id);
                         let field_tys = || {
                             field_ty_data

crates/ide/src/diagnostics.rs

@@ -2172,6 +2172,7 @@ fn main() {
 
     #[test]
     fn pattern_type_is_of_substitution() {
+        cov_mark::check!(match_check_wildcard_expanded_to_substitutions);
         check_diagnostics(
             r#"
 struct Foo<T>(T);