Type inference for objects doesn't work well for self types

[CeylonMigrationBot]

[@jvasileff] I'm not sure if this type of thing is really meant to be supported, but I keep trying to skip the step of creating companion interfaces for objects now that objects have denotable types.

shared interface Self<Other> of Other
        given Other satisfies Self<Other> {}

shared object selfObject satisfies Self<\IselfObject> {}

shared void takesSelf<S>(S arg) given S satisfies Self<S> {}

shared void callTakesSelf() {
    takesSelf(selfObject);
    // Inferred type argument Basic&Self<selfObject> to
    // type parameter S of declaration takesSelf is
    // not assignable to upper bound
    // Self<Basic&Self<selfObject>> of S
}

[Migrated from ceylon/ceylon-spec#1298]

[CeylonMigrationBot]

[@gavinking] Well it's still the rule that we never infer "anonymous" class types, so this is (inconveniently) correct and per-spec.

[CeylonMigrationBot]

[@RossTate] If y'all want, I think y'all could make any immutable reference a type and everything would still be decidable.