Use 'expectedType' (when present) as an explicit type argument for a special construct call.
Unfortunately, this approach can't be used for elvis due to other elvis-related inference hacks.
Fixes KT-10807, KT-10811.
This also affects KT-6189: now we can infer proper type for 'if'.
If type inference for special call failed, and we found no type errors in sub-expressions,
report TYPE_INFERENCE_FAILED_ON_SPECIAL_CONSTRUCT error.
This (and the hack above) fixes KT-10809: code no longer compiles.
rewrite type inference for 'when' using special constructs.
This fixes several type inference issues for 'when':
KT-9929, KT-9972, KT-10439, KT-10463
along with some other diagnostics-related issues.
- update diagnostic to (supposedly) more useful
- also report IMPLICIT_CAST_TO_ANY if expected type is DONT_CARE
(effectively "no expected type" for lambda expression).
Instead of erasing descriptors with conflicting substitution,
use invariant CapturedType(<projection>) as replacement for type parameter
within default member scope.
After substitution leave such types 'as is' everywhere except return types,
use common approximation for them.
#KT-9294 In Progress
#KT-5411 Fixed
#KT-8647 Fixed
#KT-9462 Fixed
#KT-9893 Fixed
#KT-7581 Fixed
#KT-7296 In Progress
Mikhail Glukhikh