To do so, inside the root cause of inapplicable candidate errors,
we will record expected/actual type of receiver, if any.
That will help identifying inapplicable calls on nullable receiver.
There are several issues with unsafe desugaring for convention calls.
Proper fix is not implemented here (see design proposal KT-30872).
This commit only applies the old logic in the new inference.
^KT-30695 Fixed
Here we introduce ONLY_IMPLICIT_RECEIVER tower level
to support extension lambda calls on local variables,
and soften extension receiver checks to make such extensions visible & applicable.
Also here we try to map arguments twice for functional types
Ivan Kochurkin