This is a port of CL 344872 to go/types.
Change-Id: Id794f1fc3b86779ee32dbe5e656ffc747d44c3e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/346434
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
func (t *Interface) IsComparable() bool { return t.typeSet().IsComparable() }
// IsConstraint reports whether interface t is not just a method set.
-func (t *Interface) IsConstraint() bool { return !t.typeSet().IsMethodSet() }
+func (t *Interface) IsConstraint() bool { return t.typeSet().IsConstraint() }
// Complete computes the interface's type set. It must be called by users of
// NewInterfaceType and NewInterface after the interface's embedded types are
// IsAll reports whether type set s is the set of all types (corresponding to the empty interface).
func (s *_TypeSet) IsAll() bool { return !s.comparable && len(s.methods) == 0 && s.terms.isAll() }
-// TODO(gri) IsMethodSet is not a great name for this predicate. Find a better one.
-
-// IsMethodSet reports whether the type set s is described by a single set of methods.
-func (s *_TypeSet) IsMethodSet() bool { return !s.comparable && s.terms.isAll() }
+// IsConstraint reports whether type set s is not just a set of methods.
+func (s *_TypeSet) IsConstraint() bool { return s.comparable || !s.terms.isAll() }
// IsComparable reports whether each type in the set is comparable.
func (s *_TypeSet) IsComparable() bool {
check.later(func() {
if t := asInterface(typ); t != nil {
tset := computeInterfaceTypeSet(check, pos.Pos(), t) // TODO(gri) is this the correct position?
- if !tset.IsMethodSet() {
+ if tset.IsConstraint() {
if tset.comparable {
check.softErrorf(pos, _Todo, "interface is (or embeds) comparable")
} else {