src/cmd/compile/internal/types/universe.go | 6 +++---

diff --git a/src/cmd/compile/internal/types/universe.go b/src/cmd/compile/internal/types/universe.go
index f845614e133f4b68e7f0cf672c39589e9cec462f..54b04bda2239c142eadbed33a112f8c7f5b4215f 100644
--- a/src/cmd/compile/internal/types/universe.go
+++ b/src/cmd/compile/internal/types/universe.go
@@ -57,7 +57,7 @@ 	for et := Kind(0); et < NTYPE; et++ {
 		SimType[et] = et
 	}
 
-	Types[TANY] = newType(TANY)
+	Types[TANY] = newType(TANY) // note: an old placeholder type, NOT the new builtin 'any' alias for interface{}
 	Types[TINTER] = NewInterface(LocalPkg, nil, false)
 	CheckSize(Types[TINTER])
 
@@ -91,6 +91,7 @@ 	// rather than just creating type alias *Sym's for the uint8 and
 	// int32  Hence, (bytetype|runtype).Sym.isAlias() is false.
 	// TODO(gri) Should we get rid of this special case (at the cost
 	// of less informative error messages involving bytes and runes)?
+	// NOTE(rsc): No, the error message quality is important.
 	// (Alternatively, we could introduce an OTALIAS node representing
 	// type aliases, albeit at the cost of having to deal with it everywhere).
 	ByteType = defBasic(TUINT8, BuiltinPkg, "byte")
@@ -111,12 +112,11 @@
 	// any type (interface)
 	DeferCheckSize()
 	AnyType = defBasic(TFORW, BuiltinPkg, "any")
-	AnyType.SetUnderlying(NewInterface(NoPkg, []*Field{}, false))
+	AnyType.SetUnderlying(NewInterface(BuiltinPkg, []*Field{}, false))
 	ResumeCheckSize()
 
 	if base.Flag.G == 0 {
 		ComparableType.Sym().Def = nil
-		AnyType.Sym().Def = nil
 	}
 
 	Types[TUNSAFEPTR] = defBasic(TUNSAFEPTR, UnsafePkg, "Pointer")