docs: document the return type restrictions for operator overloading (#…

…20529)
vlang · Jan 14, 2024 · acf75c7 · acf75c7
1 parent cb22407
commit acf75c7
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diff --git a/doc/docs.md b/doc/docs.md
@@ -6191,6 +6191,8 @@ To improve safety and maintainability, operator overloading is limited.
 
 - When overriding `<` and `==`, the return type must be strictly `bool`.
 - Both arguments must have the same type (just like with all operators in V).
+- Overloaded operators have to return the same type as the argument
+  (the exceptions are `<` and `==`).
 
 #### Other restrictions