Relax impls for [T; 0]

test_suite/tests/test_gen.rs

@@ -295,6 +295,11 @@ fn test_gen() {
     #[derive(Serialize, Deserialize)]
     #[serde(deny_unknown_fields)]
     struct UnitDenyUnknown;
+
+    #[derive(Serialize, Deserialize)]
+    struct EmptyArray {
+        empty: [X; 0],
+    }
 }
 
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