diff --git a/src/cmd/compile/internal/gc/bexport.go b/src/cmd/compile/internal/gc/bexport.go
index fb42519..007d762 100644
--- a/src/cmd/compile/internal/gc/bexport.go
+++ b/src/cmd/compile/internal/gc/bexport.go
@@ -652,7 +652,7 @@
 	// (look at the first parameter only since either all
 	// names are present or all are absent)
 	n := countfield(params)
-	if n > 0 && parName(params.Type) == "" {
+	if n > 0 && parName(params.Field(0)) == "" {
 		n = -n
 	}
 	p.int(n)
diff --git a/src/cmd/compile/internal/gc/cgen.go b/src/cmd/compile/internal/gc/cgen.go
index b85262b..8d1349e 100644
--- a/src/cmd/compile/internal/gc/cgen.go
+++ b/src/cmd/compile/internal/gc/cgen.go
@@ -802,7 +802,7 @@
 	}
 
 	wbVar := syslook("writeBarrier")
-	wbEnabled := Nod(ODOT, wbVar, newname(wbVar.Type.Type.Sym))
+	wbEnabled := Nod(ODOT, wbVar, newname(wbVar.Type.Field(0).Sym))
 	wbEnabled = typecheck(&wbEnabled, Erv)
 	pbr := Thearch.Ginscmp(ONE, Types[TUINT8], wbEnabled, Nodintconst(0), -1)
 	Thearch.Gins(Thearch.Optoas(OAS, Types[Tptr]), &src, &dst)
diff --git a/src/cmd/compile/internal/gc/dcl.go b/src/cmd/compile/internal/gc/dcl.go
index 8e6ff39..e3c42ac 100644
--- a/src/cmd/compile/internal/gc/dcl.go
+++ b/src/cmd/compile/internal/gc/dcl.go
@@ -1133,7 +1133,7 @@
 		return false
 	}
 	t = t.Type
-	if t.Sym != nil || t.Etype != TSTRUCT || t.Type != nil {
+	if t.Sym != nil || t.Etype != TSTRUCT || countfield(t) != 0 {
 		return false
 	}
 	return true
diff --git a/src/cmd/compile/internal/gc/esc.go b/src/cmd/compile/internal/gc/esc.go
index 72654a0..ec256e1 100644
--- a/src/cmd/compile/internal/gc/esc.go
+++ b/src/cmd/compile/internal/gc/esc.go
@@ -1478,7 +1478,7 @@
 	var src *Node
 	i := 0
 	lls := ll.Slice()
-	for t := fntype.Params().Type; i < len(lls); i++ {
+	for t, it := IterFields(fntype.Params()); i < len(lls); i++ {
 		src = lls[i]
 		if t.Isddd && !n.Isddd {
 			// Introduce ODDDARG node to represent ... allocation.
@@ -1523,7 +1523,7 @@
 			// This occurs when function parameter type Isddd and n not Isddd
 			break
 		}
-		t = t.Down
+		t = it.Next()
 	}
 
 	for ; i < len(lls); i++ {
diff --git a/src/cmd/compile/internal/gc/export.go b/src/cmd/compile/internal/gc/export.go
index 69b969d..12c51c1 100644
--- a/src/cmd/compile/internal/gc/export.go
+++ b/src/cmd/compile/internal/gc/export.go
@@ -202,8 +202,11 @@
 		OMAKECHAN:
 		t := n.Type
 
-		if t.Sym == nil && t.Type != nil {
-			t = t.Type
+		switch t.Etype {
+		case TARRAY, TCHAN, TPTR32, TPTR64:
+			if t.Sym == nil {
+				t = t.Type
+			}
 		}
 		if t != nil && t.Sym != nil && t.Sym.Def != nil && !exportedsym(t.Sym) {
 			if Debug['E'] != 0 {
@@ -280,25 +283,41 @@
 	if t == nil {
 		return
 	}
+	if t.Etype == TFIELD {
+		Fatalf("unexpected TFIELD in dumpexporttype")
+	}
 	if t.Printed || t == Types[t.Etype] || t == bytetype || t == runetype || t == errortype {
 		return
 	}
 	t.Printed = true
 
-	if t.Sym != nil && t.Etype != TFIELD {
+	if t.Sym != nil {
 		dumppkg(t.Sym.Pkg)
 	}
 
-	dumpexporttype(t.Type)
-	dumpexporttype(t.Down)
+	switch t.Etype {
+	case TSTRUCT, TINTER:
+		for f, it := IterFields(t); f != nil; f = it.Next() {
+			dumpexporttype(f.Type)
+		}
+	case TFUNC:
+		dumpexporttype(t.Recvs())
+		dumpexporttype(t.Results())
+		dumpexporttype(t.Params())
+	case TMAP:
+		dumpexporttype(t.Type)
+		dumpexporttype(t.Down) // key
+	case TARRAY, TCHAN, TPTR32, TPTR64:
+		dumpexporttype(t.Type)
+	}
 
-	if t.Sym == nil || t.Etype == TFIELD {
+	if t.Sym == nil {
 		return
 	}
 
 	var m []*Type
 	for f, it := IterMethods(t); f != nil; f = it.Next() {
-		dumpexporttype(f)
+		dumpexporttype(f.Type)
 		m = append(m, f)
 	}
 	sort.Sort(methodbyname(m))
diff --git a/src/cmd/compile/internal/gc/fmt.go b/src/cmd/compile/internal/gc/fmt.go
index 4597ceb..3363d49 100644
--- a/src/cmd/compile/internal/gc/fmt.go
+++ b/src/cmd/compile/internal/gc/fmt.go
@@ -602,7 +602,7 @@
 				buf.WriteString(";")
 			}
 		}
-		if t.Type != nil {
+		if t.Fields != nil {
 			buf.WriteString(" ")
 		}
 		buf.WriteString("}")
@@ -629,7 +629,7 @@
 		case 1:
 			if fmtmode != FExp {
 				buf.WriteString(" ")
-				buf.WriteString(Tconv(t.Results().Type.Type, 0)) // struct->field->field's type
+				buf.WriteString(Tconv(t.Results().Field(0).Type, 0)) // struct->field->field's type
 				break
 			}
 			fallthrough
@@ -687,7 +687,7 @@
 					buf.WriteString(";")
 				}
 			}
-			if t.Type != nil {
+			if t.Fields != nil {
 				buf.WriteString(" ")
 			}
 			buf.WriteString("}")
diff --git a/src/cmd/compile/internal/gc/gsubr.go b/src/cmd/compile/internal/gc/gsubr.go
index 072a666..1174703 100644
--- a/src/cmd/compile/internal/gc/gsubr.go
+++ b/src/cmd/compile/internal/gc/gsubr.go
@@ -412,7 +412,7 @@
 		// A special case to make write barriers more efficient.
 		// Taking the address of the first field of a named struct
 		// is the same as taking the address of the struct.
-		if n.Left.Type.Etype != TSTRUCT || n.Left.Type.Type.Sym != n.Right.Sym {
+		if n.Left.Type.Etype != TSTRUCT || n.Left.Type.Field(0).Sym != n.Right.Sym {
 			Debug['h'] = 1
 			Dump("naddr", n)
 			Fatalf("naddr: bad %v %v", Oconv(n.Op, 0), Ctxt.Dconv(a))
diff --git a/src/cmd/compile/internal/gc/inl.go b/src/cmd/compile/internal/gc/inl.go
index a2fee2a..45cfd6a 100644
--- a/src/cmd/compile/internal/gc/inl.go
+++ b/src/cmd/compile/internal/gc/inl.go
@@ -700,8 +700,8 @@
 		}
 	} else {
 		// match arguments except final variadic (unless the call is dotted itself)
-		var t *Type
-		for t = fn.Type.Params().Type; t != nil; {
+		t, it := IterFields(fn.Type.Params())
+		for t != nil {
 			if li >= n.List.Len() {
 				break
 			}
@@ -709,7 +709,7 @@
 				break
 			}
 			as.List.Append(tinlvar(t))
-			t = t.Down
+			t = it.Next()
 			li++
 		}
 
@@ -725,7 +725,7 @@
 			}
 
 			if i == varargcount {
-				t = t.Down
+				t = it.Next()
 			}
 		}
 
diff --git a/src/cmd/compile/internal/gc/order.go b/src/cmd/compile/internal/gc/order.go
index 1e46e44..dc1dbbd 100644
--- a/src/cmd/compile/internal/gc/order.go
+++ b/src/cmd/compile/internal/gc/order.go
@@ -371,7 +371,7 @@
 	ordercallargs(&n.List, order)
 
 	if n.Op == OCALLFUNC {
-		t := n.Left.Type.Params().Type
+		t, it := IterFields(n.Left.Type.Params())
 		for i := range n.List.Slice() {
 			// Check for "unsafe-uintptr" tag provided by escape analysis.
 			// If present and the argument is really a pointer being converted
@@ -393,7 +393,7 @@
 					*xp = x
 				}
 			}
-			t = t.Down
+			t = it.Next()
 		}
 	}
 }
diff --git a/src/cmd/compile/internal/gc/sinit.go b/src/cmd/compile/internal/gc/sinit.go
index 2ec54d2..bd600e0 100644
--- a/src/cmd/compile/internal/gc/sinit.go
+++ b/src/cmd/compile/internal/gc/sinit.go
@@ -883,19 +883,19 @@
 		tk := t.Down
 		tv := t.Type
 
-		symb := Lookup("b")
-		fieldb := typ(TFIELD)
-		fieldb.Type = tv
-		fieldb.Sym = symb
-
 		syma := Lookup("a")
-		fielda := typ(TFIELD)
-		fielda.Type = tk
-		fielda.Sym = syma
-		fielda.Down = fieldb
+		symb := Lookup("b")
+
+		var fields [2]*Type
+		fields[0] = typ(TFIELD)
+		fields[0].Type = tk
+		fields[0].Sym = syma
+		fields[1] = typ(TFIELD)
+		fields[1].Type = tv
+		fields[1].Sym = symb
 
 		tstruct := typ(TSTRUCT)
-		tstruct.Type = fielda
+		tstruct.SetFields(fields[:])
 
 		tarr := typ(TARRAY)
 		tarr.Bound = int64(b)
diff --git a/src/cmd/compile/internal/gc/sizeof_test.go b/src/cmd/compile/internal/gc/sizeof_test.go
index 29e51e5..ca862fc 100644
--- a/src/cmd/compile/internal/gc/sizeof_test.go
+++ b/src/cmd/compile/internal/gc/sizeof_test.go
@@ -27,7 +27,7 @@
 		{Name{}, 52, 80},
 		{Node{}, 92, 144},
 		{Sym{}, 60, 112},
-		{Type{}, 136, 224},
+		{Type{}, 140, 232},
 	}
 
 	for _, tt := range tests {
diff --git a/src/cmd/compile/internal/gc/subr.go b/src/cmd/compile/internal/gc/subr.go
index 9300df0..8e7704f 100644
--- a/src/cmd/compile/internal/gc/subr.go
+++ b/src/cmd/compile/internal/gc/subr.go
@@ -592,13 +592,7 @@
 }
 
 func isnilinter(t *Type) bool {
-	if !Isinter(t) {
-		return false
-	}
-	if t.Type != nil {
-		return false
-	}
-	return true
+	return Isinter(t) && countfield(t) == 0
 }
 
 func isideal(t *Type) bool {
diff --git a/src/cmd/compile/internal/gc/type.go b/src/cmd/compile/internal/gc/type.go
index 2b7010a..eb296a4 100644
--- a/src/cmd/compile/internal/gc/type.go
+++ b/src/cmd/compile/internal/gc/type.go
@@ -140,6 +140,9 @@
 	Type  *Type // actual type for TFIELD, element type for TARRAY, TCHAN, TMAP, TPTRxx
 	Width int64 // offset in TFIELD, width in all others
 
+	// TSTRUCT
+	Fields *Type // first struct field
+
 	// TFIELD
 	Down *Type   // next struct field, also key type in TMAP
 	Note *string // literal string annotation
@@ -196,7 +199,7 @@
 	if t.Etype != TSTRUCT && t.Etype != TINTER {
 		Fatalf("IterFields: type %v does not have fields", t)
 	}
-	return RawIter(t.Type)
+	return RawIter(t.Fields)
 }
 
 // IterMethods returns the first method in type t's method set
@@ -316,7 +319,7 @@
 		fields[i].Down = next
 		next = fields[i]
 	}
-	t.Type = next
+	t.Fields = next
 }
 
 func (t *Type) Size() int64 {
diff --git a/src/cmd/compile/internal/gc/typecheck.go b/src/cmd/compile/internal/gc/typecheck.go
index c49ece0..e19e161 100644
--- a/src/cmd/compile/internal/gc/typecheck.go
+++ b/src/cmd/compile/internal/gc/typecheck.go
@@ -1333,15 +1333,7 @@
 		}
 		ok |= Erv
 		if t.Outtuple == 1 {
-			t := l.Type.Results().Type
-			if t == nil {
-				n.Type = nil
-				return
-			}
-			if t.Etype == TFIELD {
-				t = t.Type
-			}
-			n.Type = t
+			n.Type = l.Type.Results().Field(0).Type
 
 			if n.Op == OCALLFUNC && n.Left.Op == ONAME && (compiling_runtime != 0 || n.Left.Sym.Pkg == Runtimepkg) && n.Left.Sym.Name == "getg" {
 				// Emit code for runtime.getg() directly instead of calling function.
@@ -1603,7 +1595,7 @@
 		var funarg *Type
 		if Istype(t, TSTRUCT) && t.Funarg {
 			funarg = t
-			t = t.Type.Type
+			t = t.Field(0).Type
 		}
 
 		n.Type = t
@@ -1642,7 +1634,8 @@
 		}
 
 		if funarg != nil {
-			for t := funarg.Type.Down; t != nil; t = t.Down {
+			_, it := IterFields(funarg) // Skip first field
+			for t := it.Next(); t != nil; t = it.Next() {
 				if assignop(t.Type, n.Type.Type, nil) == 0 {
 					Yyerror("cannot append %v value to []%v", t.Type, n.Type.Type)
 				}
@@ -2403,7 +2396,7 @@
 	s := n.Right.Sym
 
 	if t.Etype == TINTER {
-		f1 := lookdot1(n, s, t, t.Type, dostrcmp)
+		f1 := lookdot1(n, s, t, t.Fields, dostrcmp)
 		if f1 == nil {
 			return false
 		}
@@ -2464,7 +2457,7 @@
 	dowidth(t)
 	var f1 *Type
 	if t.Etype == TSTRUCT || t.Etype == TINTER {
-		f1 = lookdot1(n, s, t, t.Type, dostrcmp)
+		f1 = lookdot1(n, s, t, t.Fields, dostrcmp)
 	}
 
 	var f2 *Type
@@ -2627,11 +2620,11 @@
 					}
 				}
 
-				tn := n.Type.Type
+				tn, it := IterFields(n.Type)
 				var why string
 				for tl, it2 := IterFields(tstruct); tl != nil; tl = it2.Next() {
 					if tl.Isddd {
-						for ; tn != nil; tn = tn.Down {
+						for ; tn != nil; tn = it.Next() {
 							if assignop(tn.Type, tl.Type.Type, &why) == 0 {
 								if call != nil {
 									Yyerror("cannot use %v as type %v in argument to %v%s", tn.Type, tl.Type.Type, call, why)
@@ -2655,7 +2648,7 @@
 						}
 					}
 
-					tn = tn.Down
+					tn = it.Next()
 				}
 
 				if tn != nil {
@@ -3049,7 +3042,7 @@
 		bad := 0
 		if n.List.Len() != 0 && nokeys(n.List) {
 			// simple list of variables
-			f := t.Type
+			f, it := IterFields(t)
 
 			var s *Sym
 			ls := n.List.Slice()
@@ -3075,7 +3068,7 @@
 				n1.Left.Type = f
 				n1.Left.Typecheck = 1
 				ls[i1] = n1
-				f = f.Down
+				f = it.Next()
 			}
 
 			if f != nil {
@@ -3114,7 +3107,7 @@
 					}
 				}
 
-				f := lookdot1(nil, s, t, t.Type, 0)
+				f := lookdot1(nil, s, t, t.Fields, 0)
 				if f == nil {
 					Yyerror("unknown %v field '%v' in struct literal", t, s)
 					continue
diff --git a/src/cmd/compile/internal/gc/universe.go b/src/cmd/compile/internal/gc/universe.go
index 743b83f..1585383 100644
--- a/src/cmd/compile/internal/gc/universe.go
+++ b/src/cmd/compile/internal/gc/universe.go
@@ -367,17 +367,22 @@
 
 func lexinit1() {
 	// t = interface { Error() string }
-	rcvr := typ(TSTRUCT)
 
-	rcvr.Type = typ(TFIELD)
-	rcvr.Type.Type = Ptrto(typ(TSTRUCT))
+	rcvr := typ(TSTRUCT)
 	rcvr.Funarg = true
+	field := typ(TFIELD)
+	field.Type = Ptrto(typ(TSTRUCT))
+	rcvr.SetFields([]*Type{field})
+
 	in := typ(TSTRUCT)
 	in.Funarg = true
+
 	out := typ(TSTRUCT)
-	out.Type = typ(TFIELD)
-	out.Type.Type = Types[TSTRING]
 	out.Funarg = true
+	field = typ(TFIELD)
+	field.Type = Types[TSTRING]
+	out.SetFields([]*Type{field})
+
 	f := typ(TFUNC)
 	*f.RecvsP() = rcvr
 	*f.ResultsP() = out
@@ -386,10 +391,12 @@
 	f.Intuple = 0
 	f.Outnamed = false
 	f.Outtuple = 1
+
 	t := typ(TINTER)
-	t.Type = typ(TFIELD)
-	t.Type.Sym = Lookup("Error")
-	t.Type.Type = f
+	field = typ(TFIELD)
+	field.Sym = Lookup("Error")
+	field.Type = f
+	t.SetFields([]*Type{field})
 
 	// error type
 	s := Pkglookup("error", builtinpkg)
diff --git a/src/cmd/compile/internal/gc/walk.go b/src/cmd/compile/internal/gc/walk.go
index afc560d..cfd81f0 100644
--- a/src/cmd/compile/internal/gc/walk.go
+++ b/src/cmd/compile/internal/gc/walk.go
@@ -658,11 +658,7 @@
 			// Update type of OCALLFUNC node.
 			// Output arguments had not changed, but their offsets could.
 			if n.Left.Type.Outtuple == 1 {
-				t := n.Left.Type.Results().Type
-				if t.Etype == TFIELD {
-					t = t.Type
-				}
-				n.Type = t
+				n.Type = n.Left.Type.Results().Field(0).Type
 			} else {
 				n.Type = n.Left.Type.Results()
 			}
@@ -2008,13 +2004,7 @@
 			continue
 		}
 
-		t = on.Type.Params()
-		if t != nil {
-			t = t.Type
-		}
-		if t != nil {
-			t = t.Type
-		}
+		t = on.Type.Params().Field(0).Type
 
 		if !Eqtype(t, n.Type) {
 			n = Nod(OCONV, n, nil)