Change format of interface impl to not clash with version identifiers…

… of shared objects

src/debug.pr

@@ -874,7 +874,7 @@ export def type_to_str(tpe: &typechecking::Type, full_name: bool = false) -> Str
         case typechecking::TypeKind::TUNION, typechecking::TypeKind::VARIANT
             return variant_t_to_string(tpe, full_name)
         case typechecking::TypeKind::INTERFACE_IMPL
-            return type_to_str(tpe.tpe, full_name) + "@" + type_to_str(tpe.intf, full_name) + "#" + tpe.module.module
+            return type_to_str(tpe.tpe, full_name) + "/" + type_to_str(tpe.intf, full_name) + "#" + tpe.module.module
         case
             error(tpe.kind, "\n")
             assert