Specialize scalar helpers without variable capture

test/test_main.ml

@@ -374,6 +374,7 @@ let () =
   Test_harness.run_suite "program" program_cases;
   Test_harness.run_suite "resolve" resolve_cases;
   Test_harness.run_suite "types" Test_type.cases;
+  Test_harness.run_suite "specialize" Test_type.specialize_cases;
   Test_harness.run_suite "interpret" Test_incremental.cases;
   Printf.printf "%d cases, %d failures\n" (Test_harness.case_count ()) (Test_harness.failure_count ());
   exit (if Test_harness.failure_count () = 0 then 0 else 1)