Add a couple tests that currently hit a compiler panic

crates/compiler/test_gen/src/gen_abilities.rs

@@ -689,6 +689,31 @@ fn encode_derived_list_of_records() {
     )
 }
 
+#[test]
+#[cfg(any(feature = "gen-llvm", feature = "gen-wasm"))]
+#[ignore = "Currently hits some weird panic in borrow checking, not sure if it's directly related to abilities."]
+fn encode_derived_list_of_lists_of_strings() {
+    assert_evals_to!(
+        indoc!(
+            r#"
+            app "test"
+                imports [Encode.{ toEncoder }, Json]
+                provides [main] to "./platform"
+
+            main =
+                lst = [["a", "b"], ["c", "d", "e"], ["f"]]
+                encoded = Encode.toBytes lst Json.toUtf8
+                result = Str.fromUtf8 encoded
+                when result is
+                    Ok s -> s
+                    _ -> "<bad>"
+            "#
+        ),
+        RocStr::from(r#"[["a","b"],["c","d","e"],["f"]]"#),
+        RocStr
+    )
+}
+
 #[test]
 #[cfg(all(
     any(feature = "gen-llvm", feature = "gen-wasm"),
@@ -910,3 +935,23 @@ fn encode_then_decode_list_of_strings() {
         RocStr
     )
 }
+
+#[test]
+#[cfg(any(feature = "gen-llvm"))]
+#[ignore = "Currently hits some weird panic in borrow checking, not sure if it's directly related to abilities."]
+fn encode_then_decode_list_of_lists_of_strings() {
+    assert_evals_to!(
+        indoc!(
+            r#"
+            app "test" imports [Encode, Decode, Json] provides [main] to "./platform"
+
+            main =
+                when Encode.toBytes [["a", "b"], ["c", "d", "e"], ["f"]] Json.fromUtf8 |> Decode.fromBytes Json.fromUtf8 is
+                    Ok list -> (List.map list \inner -> Str.joinWith inner ",") |> Str.joinWith l ";"
+                    _ -> "something went wrong"
+            "#
+        ),
+        RocStr::from("a,b;c,d,e;f"),
+        RocStr
+    )
+}