go/types, types2: delete TypeList.String

This method is unused and was not discussed in the API
proposals. Note that all error output goes through the
local sprintf which handles arguments specially.

Fixes #50760.

Change-Id: Iae66b0253cc0ece037d3d280951dc2d223c119fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/381634
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>

api/go1.18.txt

@@ -51,7 +51,6 @@ pkg go/types, method (*Term) Tilde() bool
 pkg go/types, method (*Term) Type() Type
 pkg go/types, method (*TypeList) At(int) Type
 pkg go/types, method (*TypeList) Len() int
-pkg go/types, method (*TypeList) String() string
 pkg go/types, method (*TypeParam) Constraint() Type
 pkg go/types, method (*TypeParam) Index() int
 pkg go/types, method (*TypeParam) Obj() *TypeName

src/cmd/compile/internal/types2/typelists.go

@@ -4,8 +4,6 @@
 
 package types2
 
-import "bytes"
-
 // TypeParamList holds a list of type parameters.
 type TypeParamList struct{ tparams []*TypeParam }
 
@@ -54,15 +52,6 @@ func (l *TypeList) list() []Type {
  return l.types
 }
 
-func (l *TypeList) String() string {
- if l == nil || len(l.types) == 0 {
- return "[]"
- }
- var buf bytes.Buffer
- newTypeWriter(&buf, nil).typeList(l.types)
- return buf.String()
-}
-
 // ----------------------------------------------------------------------------
 // Implementation
 

src/go/types/typelists.go

@@ -4,8 +4,6 @@
 
 package types
 
-import "bytes"
-
 // TypeParamList holds a list of type parameters.
 type TypeParamList struct{ tparams []*TypeParam }
 
@@ -54,15 +52,6 @@ func (l *TypeList) list() []Type {
  return l.types
 }
 
-func (l *TypeList) String() string {
- if l == nil || len(l.types) == 0 {
- return "[]"
- }
- var buf bytes.Buffer
- newTypeWriter(&buf, nil).typeList(l.types)
- return buf.String()
-}
-
 // ----------------------------------------------------------------------------
 // Implementation