Add test

src/syntax/grammar.mly

@@ -1670,12 +1670,10 @@ and parse_call_params f p1 s =
 				mk_null_expr (punion_next p1 s)
 			in
 			match s with parser
-			| [< '(PClose,p2) >] ->
+			| [< '(PClose,p2) >]
+			| [< '(Comma,_); '(PClose,p2) >] ->
 				let e = check_signature_mark e p1 p2 in
 				f (List.rev (e :: acc)) p2
-			| [< '(Comma,p2); '(PClose,p3) >] ->
-				let e = check_signature_mark e p1 p3 in
-				f (List.rev (e :: acc)) p3
 			| [< '(Comma,p2) >] ->
 				let e = check_signature_mark e p1 p2 in
 				parse_next_param (e :: acc) p2

tests/misc/projects/trailing-commas/Main.hx

@@ -0,0 +1,43 @@
+class Main {
+	static function f(t:Type.ValueType, t2:Type.ValueType,) {}
+	public static function main():Void {
+		f(TNull,TNull,);
+		foobar(
+			1,
+			2,
+		);
+		function blah(
+			a:Int,
+			b:Int,
+		):Void {}
+		var a = (
+			a:Int,
+			b:Int,
+		) -> 0;
+		var a:(
+			a:Int,
+			b:Int,
+		)->Int = null;
+		a = (a, b,) -> a + b;
+		trace(a(2, 3,) + moduleFoobar(5, 5,));
+	}
+
+	static function foobar(
+		a:Int,
+		b:Int,
+	):Void {}
+}
+
+enum Foo {
+	Bar(
+		a:Int,
+		b:Int,
+	);
+}
+
+function moduleFoobar(
+	a:Int,
+	b:Int,
+):Int {
+	return a + b;
+}

tests/misc/projects/trailing-commas/Main2.hx

@@ -0,0 +1,6 @@
+class Main2 {
+	static function f(t:Type.ValueType, t2:Type.ValueType,,) {}
+	public static function main():Void {
+		f(TNull,TNull,);
+	}
+}

tests/misc/projects/trailing-commas/compile1.hxml

@@ -0,0 +1,2 @@
+--main Main
+--interp

tests/misc/projects/trailing-commas/compile1.hxml.stdout

@@ -0,0 +1 @@
+Main.hx:22: 15

tests/misc/projects/trailing-commas/compile2-fail.hxml

@@ -0,0 +1,2 @@
+--main Main2
+--interp

tests/misc/projects/trailing-commas/compile2-fail.hxml.stderr

@@ -0,0 +1 @@
+Main2.hx:2: characters 56-57 : Unexpected ,