From 6b8d4d879a66f2cf876a115eb1c60c14d8acea3d Mon Sep 17 00:00:00 2001
From: mappu <mappu04@gmail.com>
Date: Sat, 11 Apr 2020 12:45:26 +1200
Subject: [PATCH] node: handle trailing commas in array literals

---
 node.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/node.go b/node.go
index d7b2c99..a5f26d7 100644
--- a/node.go
+++ b/node.go
@@ -1648,6 +1648,8 @@ func (this *conversionState) convertArrayLiteralCommon(items []node.Node) (strin
 	keyType := unknownVarType
 	valType := unknownVarType
 
+	// TODO support unpack operator (...)
+
 	isMapType := false
 	for idx, itm_ := range items {
 		itm, ok := itm_.(*expr.ArrayItem)
@@ -1655,6 +1657,12 @@ func (this *conversionState) convertArrayLiteralCommon(items []node.Node) (strin
 			return "", parseErr{itm_, fmt.Errorf("expected ArrayItem")}
 		}
 
+		// If there is a trailing comma in the definition,
+		// the parser produces an empty ArrayItem with no detail information
+		if itm.Key == nil && itm.Val == nil && idx == len(items)-1 {
+			break
+		}
+
 		if idx == 0 {
 			isMapType = (itm.Key != nil)
 		} else {