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[dev.typeparams] go/types: implement TypeParam.Constraint
This is a clean port of CL 336989 to go/types. Change-Id: Ib8dbe03f420d28ada6d5fc7003ab0c82c7e06c41 Reviewed-on: https://go-review.googlesource.com/c/go/+/339650 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>
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@ -60,24 +60,32 @@ func (t *TypeParam) _SetId(id uint64) {
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t.id = id
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}
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// TODO(rfindley): document the Bound and SetBound methods.
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func (t *TypeParam) Bound() *Interface {
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// we may not have an interface (error reported elsewhere)
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iface, _ := under(t.bound).(*Interface)
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if iface == nil {
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return &emptyInterface
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}
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// Constraint returns the type constraint specified for t.
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func (t *TypeParam) Constraint() Type {
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// compute the type set if possible (we may not have an interface)
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if iface, _ := under(t.bound).(*Interface); iface != nil {
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// use the type bound position if we have one
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pos := token.NoPos
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if n, _ := t.bound.(*Named); n != nil {
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pos = n.obj.pos
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}
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// TODO(rFindley) switch this to an unexported method on Checker.
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computeTypeSet(t.check, pos, iface)
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return iface
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}
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return t.bound
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}
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// Bound returns the underlying type of the type parameter's
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// constraint.
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// Deprecated for external use. Use Constraint instead.
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func (t *TypeParam) Bound() *Interface {
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if iface, _ := under(t.Constraint()).(*Interface); iface != nil {
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return iface
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}
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return &emptyInterface
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}
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// TODO(rfindley): document the SetBound methods.
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func (t *TypeParam) SetBound(bound Type) {
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if bound == nil {
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panic("internal error: bound must not be nil")
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