diff --git a/src/cmd/compile/internal/gc/dcl.go b/src/cmd/compile/internal/gc/dcl.go
index 7c2d2a43cf..c487c237eb 100644
--- a/src/cmd/compile/internal/gc/dcl.go
+++ b/src/cmd/compile/internal/gc/dcl.go
@@ -1034,9 +1034,9 @@ func functype0(t *Type, this *Node, in, out []*Node) {
 	if this != nil {
 		rcvr = []*Node{this}
 	}
-	*t.RecvsP() = tofunargs(rcvr, FunargRcvr)
-	*t.ResultsP() = tofunargs(out, FunargResults)
-	*t.ParamsP() = tofunargs(in, FunargParams)
+	t.FuncType().Receiver = tofunargs(rcvr, FunargRcvr)
+	t.FuncType().Results = tofunargs(out, FunargResults)
+	t.FuncType().Params = tofunargs(in, FunargParams)
 
 	checkdupfields("argument", t.Recvs(), t.Results(), t.Params())
 
diff --git a/src/cmd/compile/internal/gc/type.go b/src/cmd/compile/internal/gc/type.go
index 12cb3b5993..ac038f465d 100644
--- a/src/cmd/compile/internal/gc/type.go
+++ b/src/cmd/compile/internal/gc/type.go
@@ -569,9 +569,9 @@ func substAny(t *Type, types *[]*Type) *Type {
 				results = results.Copy()
 			}
 			t = t.Copy()
-			*t.RecvsP() = recvs
-			*t.ResultsP() = results
-			*t.ParamsP() = params
+			t.FuncType().Receiver = recvs
+			t.FuncType().Results = results
+			t.FuncType().Params = params
 		}
 
 	case TSTRUCT:
@@ -676,24 +676,9 @@ func (t *Type) wantEtype(et EType) {
 	}
 }
 
-func (t *Type) RecvsP() **Type {
-	t.wantEtype(TFUNC)
-	return &t.Extra.(*FuncType).Receiver
-}
-
-func (t *Type) ParamsP() **Type {
-	t.wantEtype(TFUNC)
-	return &t.Extra.(*FuncType).Params
-}
-
-func (t *Type) ResultsP() **Type {
-	t.wantEtype(TFUNC)
-	return &t.Extra.(*FuncType).Results
-}
-
-func (t *Type) Recvs() *Type   { return *t.RecvsP() }
-func (t *Type) Params() *Type  { return *t.ParamsP() }
-func (t *Type) Results() *Type { return *t.ResultsP() }
+func (t *Type) Recvs() *Type   { return t.FuncType().Receiver }
+func (t *Type) Params() *Type  { return t.FuncType().Params }
+func (t *Type) Results() *Type { return t.FuncType().Results }
 
 // Recv returns the receiver of function type t, if any.
 func (t *Type) Recv() *Field {
diff --git a/src/cmd/compile/internal/gc/universe.go b/src/cmd/compile/internal/gc/universe.go
index 270d4c3770..1e5650ffc2 100644
--- a/src/cmd/compile/internal/gc/universe.go
+++ b/src/cmd/compile/internal/gc/universe.go
@@ -375,9 +375,9 @@ func makeErrorInterface() *Type {
 	out.SetFields([]*Field{field})
 
 	f := typ(TFUNC)
-	*f.RecvsP() = rcvr
-	*f.ResultsP() = out
-	*f.ParamsP() = in
+	f.FuncType().Receiver = rcvr
+	f.FuncType().Results = out
+	f.FuncType().Params = in
 
 	t := typ(TINTER)
 	field = newField()