checker: support lambda expressions in array methods like a.map(|x|x*10) too (#19424)

vlib/builtin/lambda_expr_array_test.v

@@ -0,0 +1,35 @@
+const a = [4, 5, 1, 2, 5, 9]
+
+fn test_map() {
+	assert a.map(it) == a
+	assert a.map(it * 10) == [40, 50, 10, 20, 50, 90]
+	//
+	assert a.map(|x| x) == a
+	assert a.map(|x| x * 10) == [40, 50, 10, 20, 50, 90]
+	assert a.map(|x| 'x: ${x}') == ['x: 4', 'x: 5', 'x: 1', 'x: 2', 'x: 5', 'x: 9']
+	assert a.map(|x| f64(x) * 10.0) == [40.0, 50.0, 10.0, 20.0, 50.0, 90.0]
+}
+
+fn test_filter() {
+	assert a.filter(it > 4) == [5, 5, 9]
+	assert a.filter(it < 4) == [1, 2]
+	//
+	assert a.filter(|x| x > 4) == [5, 5, 9]
+	assert a.filter(|x| x < 4) == [1, 2]
+}
+
+fn test_any() {
+	assert a.any(it > 4)
+	assert !a.any(it > 40)
+
+	assert a.any(|x| x > 4)
+	assert !a.any(|x| x > 40)
+}
+
+fn test_all() {
+	assert !a.all(it > 4)
+	assert a.all(it < 40)
+
+	assert !a.all(|x| x > 4)
+	assert a.all(|x| x < 40)
+}