diff --git a/generate/generate.go b/generate/generate.go
index 7355bf8..6245064 100644
--- a/generate/generate.go
+++ b/generate/generate.go
@@ -589,11 +589,11 @@ func (this *Generator) generateDecodeBranchCall(typ Type, valueSource, tagSource
 // generateDecodeBranch generates an aggregate decoder function definition for a
 // specified type. It assumes that hash == HashType(typ).
 func (this *Generator) generateDecodeBranch(hash [16]byte, typ Type) (n int, err error) {
-	nn, err := this.iprintf("\nfunc %s(this *", this.decodeBranchName(hash))
+	nn, err := this.iprintf("\nfunc %s[T ~", this.decodeBranchName(hash))
 	n += nn; if err != nil { return n, err }
 	nn, err = this.generateType(typ)
 	n += nn; if err != nil { return n, err }
-	nn, err = this.printf(", decoder *tape.Decoder, tag tape.Tag) (nn int, err error) {\n")
+	nn, err = this.printf("](this *T, decoder *tape.Decoder, tag tape.Tag) (nn int, err error) {\n")
 	n += nn; if err != nil { return n, err }
 	this.push()
 	
@@ -632,7 +632,7 @@ func (this *Generator) generateDecodeBranch(hash [16]byte, typ Type) (n int, err
 				this.pop()
 				nn, err = this.iprintf("}\n")
 				n += nn; if err != nil { return n, err }
-				nn, err = this.iprintf("return n, nil")
+				nn, err = this.iprintf("return n, nil\n")
 				n += nn; if err != nil { return n, err }
 				return n, nil
 			}