Add a test for big encoders enabled by disjoint specialization variables

crates/compiler/test_gen/src/gen_abilities.rs

@@ -684,3 +684,30 @@ fn encode_derived_list_of_records() {
         RocStr
     )
 }
+
+#[test]
+#[cfg(any(feature = "gen-llvm"))]
+fn encode_derived_record_with_many_types() {
+    assert_evals_to!(
+        indoc!(
+            r#"
+            app "test"
+                imports [Encode.{ toEncoder }, Json]
+                provides [main] to "./platform"
+
+            main =
+                fresh : [Fresh Str, Rotten Str]
+                fresh = Fresh "tomatoes"
+                rcd = {actors: ["Idris Elba", "Mila Kunis"], year: 2004u16, rating: {average: 7u8, min: 1u8, max: 10u8, sentiment: fresh}}
+                result = Str.fromUtf8 (Encode.toBytes rcd Json.toUtf8)
+                when result is
+                    Ok s -> s
+                    _ -> "<bad>"
+            "#
+        ),
+        RocStr::from(
+            r#"{"actors":["Idris Elba","Mila Kunis"],"rating":{"average":7,"max":10,"min":1,"sentiment":{"Fresh":["tomatoes"]}},"year":2004}"#
+        ),
+        RocStr
+    )
+}