[dev.typeparams] cmd/compile/internal/types2: use converter functions rather than methods

This change replaces methods with functions to reduce the API surface of
types2.Type and to match the approach taken in go/types. The converter
methods for Named and TypeParam will be addressed in a follow-up CL.

Also: Fixed behavior of optype to return the underlying type for
      arguments that are not type parameters.

Change-Id: Ia369c796754bc33bbaf0c9c8478badecb729279b
Reviewed-on: https://go-review.googlesource.com/c/go/+/293291
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>

1 files changed, 0 insertions, 11 deletions

diff --git a/src/cmd/compile/internal/importer/support.go b/src/cmd/compile/internal/importer/support.go
index 4f013f4a51..cac87745fe 100644
--- a/src/cmd/compile/internal/importer/support.go
+++ b/src/cmd/compile/internal/importer/support.go
@@ -129,16 +129,5 @@ func (t anyType) Under() types2.Type      { return t }
 func (t anyType) String() string          { return "any" }
 
 // types2.aType is not exported for now so we need to implemented these here.
-func (anyType) Basic() *types2.Basic         { return nil }
-func (anyType) Array() *types2.Array         { return nil }
-func (anyType) Slice() *types2.Slice         { return nil }
-func (anyType) Struct() *types2.Struct       { return nil }
-func (anyType) Pointer() *types2.Pointer     { return nil }
-func (anyType) Tuple() *types2.Tuple         { return nil }
-func (anyType) Signature() *types2.Signature { return nil }
-func (anyType) Sum() *types2.Sum             { return nil }
-func (anyType) Interface() *types2.Interface { return nil }
-func (anyType) Map() *types2.Map             { return nil }
-func (anyType) Chan() *types2.Chan           { return nil }
 func (anyType) Named() *types2.Named         { return nil }
 func (anyType) TypeParam() *types2.TypeParam { return nil }