Drop node-ptr in node features, macro calls.
Drop node-ptr types in rule templates and recover closures,
fix BiConsumer params
Drop node-ptr// refs where appropriate.
Drop pointer operations from macro calls and term ctor's; add resolve to FunctionTypeLookup static table.
Drop node pointer operations from constraints, add require statements in SModel types macro table.
Ensure valid list of context type var decls is passed to
instantiateScheme macro.
The code in MethodCall needs to be fixed in order to respect
context type variables in case of instantiation of a non-static inner class.
Contract stems from the fact that constraint args influence Rules hashes (unique tags)
and so must be stable under irrelevant changes for incremental logic
Now whether unchecked conversion is allowed is controlled
by ConvertsContext.Options of convertsTo relation.
Introduce 'erased()' term to be used in raw type params.
Drop 'uncheckedConversion' parameter in all macros.
Classifier kind:"raw" is now used only for Recover.
Allow unchecked conversions by default. Forbid for sequences.
Matching on two constraints without an "anchor" (origin)
is essentialy quadratic. On a large root there may be
many typeof/expectType instances and it slows down the
computation considerably.
In with the above flag set to false a conversion of list<T> to list (raw type)
fails, because the latter is represented as list<Object>. (T is any type).
This situation usually arises from queries like coerce(T to concept=ListType).
It was aimed at precluding cascading typechecking failures.
(There was some case with typechecking 'hasBound' after incorrect bind.)
It seems controversial. Typechecking with it is no more predictable
than with free variables left unbound in case of error.
With current tests almost nothing changes after removing it.
These unused in bodies constraints were for tracking certain
cases of incremental dependencies. Now it's handled by minor
algorithm extension introduced in several previous commits.
Fixes IncrClosureInference.changeFunctionalInterfaceParam test.
Temporary rules built as macro applications weren't computing hash
due to origin!=null condition. Also macro inputs weren't processed.
Stable hash for TypeVarSubstitution is defined because it's used in macro args.
In general, any classes used as constraint/predicate/macro args
must adhere to stable hashCode() contract: hash should change
if there're important changes that may influence typechecking result.
Otherwise there may be unnecessary incremental recomputations.
Relevant for MPSCR-62
UndefinedType should leave the logical variable unassigned.
Type is an abstract superconcept, so reaching it means
there should have an override for lift macro.
Replace unification with the intent of capturing term feature
with match constraint.
Drop unused term feature from head pattern.
Provide better context for failed class inheritance test.
Hierarchy graph vertex can represent LUB as a simple
collection of inheritance paths.
Abstract intefaces allow to model operations such as finding
the LUB in an abstract way.
Greatly simplify code.
Fedor Isakov