true
false
-Reciever is null in rterror_null_receiver_alt1::Sys::(kernel::Sys::main) (alt/rterror_null_receiver_alt1.nit:26)
+Reciever is null (alt/rterror_null_receiver_alt1.nit:26)
,---- Stack trace -- - - -
| rterror_null_receiver_alt1::Sys::(kernel::Sys::main) (alt/rterror_null_receiver_alt1.nit:23)
`------------------- - - -