Generate phi node for default case in match switch

generator/expression.go

@@ -150,6 +150,12 @@ func (this *generator) generateMatch (match *entity.Match, mode resultMode) (llv
 	if mode == resultModeAny {
 		return nil, false, nil
 	} else {
+		irType, err := this.generateType(match.Type())
+		if err != nil { return nil, false, err }
+		irIncomings = append(irIncomings, &llvm.Incoming {
+			X:           llvm.NewConstZeroInitializer(irType),
+			Predecessor: previousBlock,
+		})
 		return this.blockManager.NewPhi(irIncomings...), loc, nil
 	}
 }