Prefer debug! to never! and add regression test

crates/hir-ty/src/diagnostics/match_check/pat_analysis.rs

@@ -1,6 +1,7 @@
 //! Interface with `rustc_pattern_analysis`.
 
 use std::fmt;
+use tracing::debug;
 
 use hir_def::{DefWithBodyId, EnumVariantId, HasModule, LocalFieldId, ModuleId, VariantId};
 use rustc_hash::FxHashMap;
@@ -475,7 +476,7 @@ fn write_variant_name(
     }
 
     fn bug(&self, fmt: fmt::Arguments<'_>) {
-        never!("{}", fmt)
+        debug!("{}", fmt)
     }
 }
 

crates/ide-diagnostics/src/handlers/missing_match_arms.rs

@@ -310,6 +310,24 @@ fn main() {
         );
     }
 
+    #[test]
+    fn mismatched_types_issue_15883() {
+        // Check we don't panic.
+        check_diagnostics_no_bails(
+            r#"
+//- minicore: option
+fn main() {
+    match Some((true, false)) {
+        Some(true) | Some(false) => {}
+        //   ^^^^ error: expected (bool, bool), found bool
+        //                ^^^^^ error: expected (bool, bool), found bool
+        None => {}
+    }
+}
+            "#,
+        );
+    }
+
     #[test]
     fn mismatched_types_in_or_patterns() {
         cov_mark::check_count!(validate_match_bailed_out, 2);