cmd/compile/internal/types2: use []*TypeParam rather than []*TypeName for type param lists

This is a port of CL 343932 from go/types, with the necessary adjustments
to the compiler.

This change improves type safety slightly, avoids many internal type
assertions, and simplifies some code paths.

Change-Id: Ie9c4734814f49cd248927152d7b3264d3578428c
Reviewed-on: https://go-review.googlesource.com/c/go/+/344614
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Dan Scales <danscales@google.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/src/cmd/compile/internal/types2/typeparam.go b/src/cmd/compile/internal/types2/typeparam.go
index f666fae7ed..0d76dd1a6e 100644
--- a/src/cmd/compile/internal/types2/typeparam.go
+++ b/src/cmd/compile/internal/types2/typeparam.go
@@ -84,7 +84,7 @@ func (t *TypeParam) Underlying() Type { return t }
 func (t *TypeParam) String() string   { return TypeString(t, nil) }
 
 // TParamList holds a list of type parameters bound to a type.
-type TParamList struct{ tparams []*TypeName }
+type TParamList struct{ tparams []*TypeParam }
 
 // Len returns the number of type parameters in the list.
 // It is safe to call on a nil receiver.
@@ -93,23 +93,22 @@ func (tps *TParamList) Len() int {
 }
 
 // At returns the i'th type parameter in the list.
-func (tps *TParamList) At(i int) *TypeName {
+func (tps *TParamList) At(i int) *TypeParam {
 	return tps.list()[i]
 }
 
-func (tps *TParamList) list() []*TypeName {
+func (tps *TParamList) list() []*TypeParam {
 	if tps == nil {
 		return nil
 	}
 	return tps.tparams
 }
 
-func bindTParams(list []*TypeName) *TParamList {
+func bindTParams(list []*TypeParam) *TParamList {
 	if len(list) == 0 {
 		return nil
 	}
-	for i, tp := range list {
-		typ := tp.Type().(*TypeParam)
+	for i, typ := range list {
 		if typ.index >= 0 {
 			panic("type parameter bound more than once")
 		}