#44: do not trim last nil if array item list ends by a comma

php7/php7.go

@@ -7517,8 +7517,8 @@ yydefault:
 		yyDollar = yyS[yypt-1 : yypt+1]
 		//line php7/php7.y:4861
 		{
-			if yyDollar[1].list[len(yyDollar[1].list)-1] == nil {
-				yyVAL.list = yyDollar[1].list[:len(yyDollar[1].list)-1]
+			if len(yyDollar[1].list) == 1 && yyDollar[1].list[0] == nil {
+				yyVAL.list = yyDollar[1].list[:0]
 			} else {
 				yyVAL.list = yyDollar[1].list
 			}

php7/php7.y

@@ -4859,8 +4859,8 @@ property_name:
 array_pair_list:
         non_empty_array_pair_list
             {
-                if ($1[len($1)-1] == nil) {
-                    $$ = $1[:len($1)-1]
+                if (len($1) == 1 && $1[0] == nil) {
+                    $$ = $1[:0]
                 } else {
                     $$ = $1
                 }

php7/php7_test.go

@@ -2072,6 +2072,7 @@ func TestPhp7(t *testing.T) {
 						&expr.ArrayItem{
 							Val: &expr.Reference{Variable: &expr.Variable{VarName: &node.Identifier{Value: "b"}}},
 						},
+						nil,
 					},
 				},
 			},
@@ -2475,6 +2476,7 @@ func TestPhp7(t *testing.T) {
 						&expr.ArrayItem{
 							Val: &expr.Reference{Variable: &expr.Variable{VarName: &node.Identifier{Value: "b"}}},
 						},
+						nil,
 					},
 				},
 			},