go/types, types2: unexport NewTypeList

NewTypeList was not part of the go/types API proposal, and was left in
by accident. It also shouldn't be necessary, so remove it.

Updates #47916

Change-Id: I4db3ccf036ccfb708ecf2c176ea4921fe68089a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/369475
Trust: Robert Findley <[email protected]>
Run-TryBot: Robert Findley <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Robert Griesemer <[email protected]>

Author: findleyr

Diff for: doc/go1.18.html

@@ -516,9 +516,7 @@ <h3 id="minor_library_changes">Minor changes to the library</h3>
       </li>
       <li>
         The new type
-        <a href="/pkg/go/types/#TypeList"><code>TypeList</code></a> and factory function
-        <a href="/pkg/go/types/#NewTypeList"><code>NewTypeList</code></a> facilitate storing
-        a list of types.
+        <a href="/pkg/go/types/#TypeList"><code>TypeList</code></a> holds a list of types.
       </li>
       <li>
         The new factory function

Diff for: src/cmd/compile/internal/types2/check.go

@@ -494,7 +494,7 @@ func (check *Checker) recordInstance(expr syntax.Expr, targs []Type, typ Type) {
 	assert(ident != nil)
 	assert(typ != nil)
 	if m := check.Instances; m != nil {
-		m[ident] = Instance{NewTypeList(targs), typ}
+		m[ident] = Instance{newTypeList(targs), typ}
 	}
 }
 

Diff for: src/cmd/compile/internal/types2/instantiate.go

@@ -77,7 +77,7 @@ func (check *Checker) instance(pos syntax.Pos, orig Type, targs []Type, ctxt *Co
 	case *Named:
 		tname := NewTypeName(pos, orig.obj.pkg, orig.obj.name, nil)
 		named := check.newNamed(tname, orig, nil, nil, nil) // underlying, tparams, and methods are set when named is resolved
-		named.targs = NewTypeList(targs)
+		named.targs = newTypeList(targs)
 		named.resolver = func(ctxt *Context, n *Named) (*TypeParamList, Type, []*Func) {
 			return expandNamed(ctxt, n, pos)
 		}

Diff for: src/cmd/compile/internal/types2/typelists.go

@@ -29,8 +29,8 @@ func (l *TypeParamList) list() []*TypeParam {
 // TypeList holds a list of types.
 type TypeList struct{ types []Type }
 
-// NewTypeList returns a new TypeList with the types in list.
-func NewTypeList(list []Type) *TypeList {
+// newTypeList returns a new TypeList with the types in list.
+func newTypeList(list []Type) *TypeList {
 	if len(list) == 0 {
 		return nil
 	}

Diff for: src/cmd/compile/internal/types2/typexpr.go

@@ -442,7 +442,7 @@ func (check *Checker) instantiatedType(x syntax.Expr, xlist []syntax.Expr, def *
 	if inst == nil {
 		tname := NewTypeName(x.Pos(), orig.obj.pkg, orig.obj.name, nil)
 		inst = check.newNamed(tname, orig, nil, nil, nil) // underlying, methods and tparams are set when named is resolved
-		inst.targs = NewTypeList(targs)
+		inst.targs = newTypeList(targs)
 		inst = ctxt.update(h, orig, targs, inst).(*Named)
 	}
 	def.setUnderlying(inst)
@@ -456,7 +456,7 @@ func (check *Checker) instantiatedType(x syntax.Expr, xlist []syntax.Expr, def *
 			// be set to Typ[Invalid] in expandNamed.
 			inferred = check.infer(x.Pos(), tparams, targs, nil, nil)
 			if len(inferred) > len(targs) {
-				inst.targs = NewTypeList(inferred)
+				inst.targs = newTypeList(inferred)
 			}
 		}
 

Diff for: src/go/types/check.go

@@ -487,7 +487,7 @@ func (check *Checker) recordInstance(expr ast.Expr, targs []Type, typ Type) {
 	assert(ident != nil)
 	assert(typ != nil)
 	if m := check.Instances; m != nil {
-		m[ident] = Instance{NewTypeList(targs), typ}
+		m[ident] = Instance{newTypeList(targs), typ}
 	}
 }
 

Diff for: src/go/types/instantiate.go

@@ -77,7 +77,7 @@ func (check *Checker) instance(pos token.Pos, orig Type, targs []Type, ctxt *Con
 	case *Named:
 		tname := NewTypeName(pos, orig.obj.pkg, orig.obj.name, nil)
 		named := check.newNamed(tname, orig, nil, nil, nil) // underlying, tparams, and methods are set when named is resolved
-		named.targs = NewTypeList(targs)
+		named.targs = newTypeList(targs)
 		named.resolver = func(ctxt *Context, n *Named) (*TypeParamList, Type, []*Func) {
 			return expandNamed(ctxt, n, pos)
 		}

Diff for: src/go/types/typelists.go

@@ -29,8 +29,8 @@ func (l *TypeParamList) list() []*TypeParam {
 // TypeList holds a list of types.
 type TypeList struct{ types []Type }
 
-// NewTypeList returns a new TypeList with the types in list.
-func NewTypeList(list []Type) *TypeList {
+// newTypeList returns a new TypeList with the types in list.
+func newTypeList(list []Type) *TypeList {
 	if len(list) == 0 {
 		return nil
 	}

Diff for: src/go/types/typexpr.go

@@ -427,7 +427,7 @@ func (check *Checker) instantiatedType(ix *typeparams.IndexExpr, def *Named) (re
 	if inst == nil {
 		tname := NewTypeName(ix.X.Pos(), orig.obj.pkg, orig.obj.name, nil)
 		inst = check.newNamed(tname, orig, nil, nil, nil) // underlying, methods and tparams are set when named is resolved
-		inst.targs = NewTypeList(targs)
+		inst.targs = newTypeList(targs)
 		inst = ctxt.update(h, orig, targs, inst).(*Named)
 	}
 	def.setUnderlying(inst)
@@ -441,7 +441,7 @@ func (check *Checker) instantiatedType(ix *typeparams.IndexExpr, def *Named) (re
 			// be set to Typ[Invalid] in expandNamed.
 			inferred = check.infer(ix.Orig, tparams, targs, nil, nil)
 			if len(inferred) > len(targs) {
-				inst.targs = NewTypeList(inferred)
+				inst.targs = newTypeList(inferred)
 			}
 		}