fix #3202

vlib/builtin/array_test.v

@@ -542,3 +542,17 @@ fn test_for_last() {
 	assert s == '[1, 2, 3, 4]'
 }
 */
+
+struct Foo {
+	mut:
+	bar []int
+}
+
+fn test_in_struct() {
+	mut baz := Foo{
+		bar: [0, 0, 0]
+	}
+	baz.bar[0] += 2
+	baz.bar[0]++
+	assert baz.bar[0] == 3
+}

vlib/compiler/parser.v

@@ -1964,7 +1964,7 @@ fn (p mut Parser) var_expr(v Var) string {
 		// p.print_tok()
 		// dc++
 		if p.tok == .lsbr {
-			// typ = p.index_expr(typ, fn_ph, v)
+			typ = p.index_expr(typ, fn_ph)
 		}
 	}
 	// `a++` and `a--`