Constraint

A new constraint which is derived from this constraint by adding entries for all type parameters of poly.

A constraint that includes the relationship p1 <: p2. <: relationships between parameters ("edges") are propagated, but non-parameter bounds are left alone.

The current bounds of type parameter param

Check that constraint only refers to TypeParamRefs bound by itself

Check that every typevar om this constraint has as origin a type parameter of athe type lambda that is associated with the typevar itself.

Depending on Config settngs:

• Under checkConstraintsNonCyclic, check that no constrained parameter contains itself as a bound.
• Under checkConstraintDeps, check hat reverse dependencies in constraints are correct and complete.

Does the constraint's domain contain the type parameters of tl?

Does the constraint's domain contain the type parameter param?

Does this constraint contain the type variable tvar and is it uninstantiated?

Does the constraint restricted to variables outside except depend on tv in the given direction co?

A string that shows the reverse dependencies maintained by this constraint (coDeps and contraDeps for OrderingConstraints).

The type lambdas constrained by this constraint

The type lambda parameters constrained by this constraint

The given tl in case it is not contained in this constraint, a fresh copy of tl otherwise.

The constraint entry for given type parameter param, or NoType if param is not part of the constraint domain. Note: Low level, implementation dependent.

lower(param) \ lower(butNot)

upper(param) \ upper(butNot)

Check whether predicate holds for all parameters in constraint

Perform operation op on all typevars that do not have their inst field set.

Whether tl is present in both this and that but is associated with different TypeVars there, meaning that the constraints cannot be merged.

Gives for each instantiated type var that does not yet have its inst field set, the instance value stored in the constraint. Storing instances in constraints is done only in a temporary way for contexts that may be retracted without also retracting the type var as a whole.

Is tv marked as hard in the constraint?

Is it known that param1 <:< param2?

Is entry associated with tl removable? This is the case if all type parameters of the entry are associated with type variables which have their inst fields set.

The parameters that are known to be smaller wrt <: than param

The lower dominator set.

This is like lower, except that each parameter returned is no smaller than every other returned parameter.

The upper dominator set.

This is like upper, except that each parameter returned is no greater than every other returned parameter.

The constraint bounds for given type parameter param. Poly params that are known to be smaller or greater than param are not contained in the return bounds.

Does param occur at the toplevel in tp ? Toplevel means: the type itself or a factor in some combination of & or | types.

A new constraint with all entries coming from tl removed.

A new constraint which is derived from this constraint by removing the type parameter param from the domain and replacing all top-level occurrences of the parameter elsewhere in the constraint by type tp, or a conservative approximation of it if that is needed to avoid cycles. Occurrences nested inside a refinement or prefix are not affected.

A new constraint with entry from replaced with to Rerences to from from within other constraint bounds are updated to to. Type variables are left alone.

The type variable corresponding to parameter param, or NoType, if param is not in constrained or is not paired with a type variable.

The uninstantiated typevars of this constraint, which still have a bounds constraint

A new constraint which is derived from this constraint by updating the entry for parameter param to tp. tp can be one of the following:

• A TypeBounds value, indicating new constraint bounds
• Another type, indicating a solution for the parameter

The parameters that are known to be greater wrt <: than param

Sanitize bound to make it either a valid upper or lower bound for param depending on isUpper.

Toplevel references to param, are replaced by Any if isUpper is true and Nothing otherwise.

Sanitize bounds to make them valid constraints for param.

The same as this constraint, but with tv marked as hard.

A fallback text representation, if the pattern matching in Printers does not have a case for this showable element

The string representation of this showable element.

The string representation with each line after the first one indented by the given given margin (in spaces).

The summarized string representation of this showable element. Recursion depth is limited to some smallish value. Default is Config.summarizeDepth.

The text representation of this showable element. This normally dispatches to a pattern matching method in Printers.