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go/types: add the Interface.IsMethodSet method

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As pointed out in #47916, the IsConstraint method becomes ambiguously
named if ever we allow interfaces with structural restrictions outside
of constraint position.

Add instead an IsMethodSet method, which has the opposite sense and
avoids this ambiguity. In a subsequent CL the IsConstraint method will
be removed, once x/tools has been updated to use the IsMethodSet API.

Updates #47916

Change-Id: I82ad16b111464b0cd2f354b8ecdd4b3f14796cd9
Reviewed-on: https://go-review.googlesource.com/c/go/+/352616
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>
This commit is contained in:
Robert Findley 2021-09-27 19:49:38 -04:00
parent 5511f14a73
commit 02d56a1584
1 changed files with 6 additions and 0 deletions
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6
src/go/types/interface.go
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@ -104,7 +104,13 @@ func (t *Interface) Empty() bool { return t.typeSet().IsAll() }
// IsComparable reports whether each type in interface t's type set is comparable.
func (t *Interface) IsComparable() bool { return t.typeSet().IsComparable() }
// IsMethodSet reports whether the interface t is fully described by its method
// set.
func (t *Interface) IsMethodSet() bool { return !t.typeSet().IsConstraint() }
// IsConstraint reports whether interface t is not just a method set.
//
// TODO(rfindley): remove this method.
func (t *Interface) IsConstraint() bool { return t.typeSet().IsConstraint() }
// Complete computes the interface's type set. It must be called by users of