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
Add 'genDecl' constraint in heads of toFunctionalCls* rules
to handle incremental changes to respective classifier.
Also fail instead of just reporting error to break execution and
report on correct node according to calling rule.
UndefinedType should leave the logical variable unassigned.
Type is an abstract superconcept, so reaching it means
there should have an override for lift macro.
DataFormPrinter is hardcoded to support _term and _subterm
hacks and present the terms in a readable way.
Memoizer is searched for an implementation of
NodePresentable, which helps with visualization of SNode
and SNodeReference.
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.
Term constructor creates all features with default values where
not overridden. The default values for "value" and "child"
features are wildcards for now (TBD), the default value for
list feature is an empty list.
The rationale is that a rule's head defining term pattern with
a logical variable capturing list feature will not be matched
with a free logical variable. Thus, to avoid having to always
explicitly specify all term features, a term constructor that
is not a pattern must use the default values for non-overridden
features.
Match constraint is provided for use cases where the intention
is to pattern-match a term capturing features into logical
variables.
A term constructor in the right-hand side of match constraint
is a pattern, and all its non-overridden features are
to be defined as wildcards.
Some time ago "mixed" matches (with both principal and non-principal heads)
were allowed and are handled by Journal. So now principal constraints
can lead to non-principal matches, which renders assert invalid.
(Relevant for MPSCR-62)
It's possible to activate constraints in macros, so they must be also handled.
Also restrict a bit principal rules analysis: consider only rules with template input.
Grigorii Kirgizov