Add `toString()` implementations for `MoreTypes.equivalence()` and `AnnotationMirrors.equivalence()`

They often come up in debugging information

RELNOTES=n/a
PiperOrigin-RevId: 357734043

2 files changed, 10 insertions, 0 deletions

diff --git a/common/src/main/java/com/google/auto/common/AnnotationMirrors.java b/common/src/main/java/com/google/auto/common/AnnotationMirrors.java
index 62e5834e..737857b0 100644
--- a/common/src/main/java/com/google/auto/common/AnnotationMirrors.java
+++ b/common/src/main/java/com/google/auto/common/AnnotationMirrors.java
@@ -58,6 +58,11 @@ public final class AnnotationMirrors {
           return Arrays.hashCode(new int[] {MoreTypes.equivalence().hash(type),
               AnnotationValues.equivalence().pairwise().hash(annotationValues)});
         }
+
+        @Override
+        public String toString() {
+         return "AnnotationMirrors.equivalence()";
+        }
     };
 
   /**
diff --git a/common/src/main/java/com/google/auto/common/MoreTypes.java b/common/src/main/java/com/google/auto/common/MoreTypes.java
index d592bfaa..b84432f4 100644
--- a/common/src/main/java/com/google/auto/common/MoreTypes.java
+++ b/common/src/main/java/com/google/auto/common/MoreTypes.java
@@ -75,6 +75,11 @@ public final class MoreTypes {
     protected int doHash(TypeMirror t) {
       return MoreTypes.hash(t, ImmutableSet.<Element>of());
     }
+
+    @Override
+    public String toString() {
+      return "MoreTypes.equivalence()";
+    }
   }
 
   /**