true
false
-Reciever is null in rterror_null_receiver_alt3::Sys::(kernel::Sys::main) (alt/rterror_null_receiver_alt3.nit:28)
+Reciever is null (alt/rterror_null_receiver_alt3.nit:28)
,---- Stack trace -- - - -
| rterror_null_receiver_alt3::Sys::(kernel::Sys::main) (alt/rterror_null_receiver_alt3.nit:23)
`------------------- - - -