builtin: test left/right shift precedence

vlib/builtin/array_test.v

@@ -692,6 +692,19 @@ fn test_hex(){
 	assert st1.hex() == "41".repeat(100)
 }
 
+fn test_left_shift_precendence() {
+	mut arr := []int
+	arr << 1 + 1
+	arr << 1 - 1
+	arr << 2 / 1
+	arr << 2 * 1
+
+	assert arr[0] == 2
+	assert arr[1] == 0
+	assert arr[2] == 2
+	assert arr[3] == 2
+}
+
 fn test_array_with_cap() {
 	a := []int{cap:10, len:1 }
 	//assert a.len == 1

vlib/builtin/int_test.v

@@ -100,6 +100,16 @@ fn test_xor_precendence() {
 	assert (1 ^ 0 > 1) == ((1 ^ 0) > 1)
 }
 
+fn test_left_shift_precendence() {
+	assert (2 << 4 | 3) == ((2 << 4) | 3)
+	assert (2 << 4 | 3) != (2 << (4 | 3))
+}
+
+fn test_right_shift_precendence() {
+	assert (256 >> 4 | 3) == ((256 >> 4) | 3)
+	assert (256 >> 4 | 3) != (256 >> (4 | 3))
+}
+
 fn test_i8_print() {
 	b := i8(0)
 	println(b)