1 files changed, 17 insertions, 9 deletions
diff --git a/tests/ui/pattern/move-ref-patterns/pattern-ref-bindings-reassignment.rs b/tests/ui/pattern/move-ref-patterns/pattern-ref-bindings-reassignment.rs
index d6d41e959d9..42b0b9ac44d 100644
--- a/tests/ui/pattern/move-ref-patterns/pattern-ref-bindings-reassignment.rs
+++ b/tests/ui/pattern/move-ref-patterns/pattern-ref-bindings-reassignment.rs
@@ -1,16 +1,24 @@
-// Tests how we behave when the user attempts to mutate an immutable
-// binding that was introduced by either `ref` or `ref mut`
-// patterns.
-//
-// Such bindings cannot be made mutable via the mere addition of the
-// `mut` keyword, and thus we want to check that the compiler does not
-// suggest doing so.
+//! Tests how we behave when the user attempts to mutate an immutable
+//! binding that was introduced by either `ref` or `ref mut`
+//! patterns.
+//!
+//! Such bindings cannot be made mutable via the mere addition of the
+//! `mut` keyword, and thus we want to check that the compiler does not
+//! suggest doing so.
 
 fn main() {
     let (mut one_two, mut three_four) = ((1, 2), (3, 4));
+
+    // Bind via pattern:
+    // - `a` as immutable reference (`ref`)
+    // - `b` as mutable reference (`ref mut`)
     let &mut (ref a, ref mut b) = &mut one_two;
+
+    // Attempt to reassign immutable `ref`-bound variable
     a = &three_four.0;
-    //~^ ERROR cannot assign twice to immutable variable `a` [E0384]
+    //~^ ERROR cannot assign twice to immutable variable `a`
+
+    // Attempt to reassign mutable `ref mut`-bound variable
     b = &mut three_four.1;
-    //~^ ERROR cannot assign twice to immutable variable `b` [E0384]
+    //~^ ERROR cannot assign twice to immutable variable `b`
 }