test: cover unknown compatibility return expressions

2026-09-19 01:43:51 +00:00
parent b79db4f25c
commit 039da8159e
6 changed files with 17 additions and 0 deletions
@@ -102,6 +102,8 @@ Function square's return value could not be understood yet. Use a NUMBER express

 Use a known typed value, such as a parameter checked with `CHECK TYPE`, while broader expression inference remains future work.

+The same learner-facing diagnostic applies to compatibility functions written with `TAKES` / `LEARNED`, so older lessons do not get a less-helpful error when a return expression is still unknown.
+
 Known NUMBER parameters can also be used in arithmetic return expressions. Numeric division is accepted when both operands are known numbers:

 ```claro