tests: add 2 simpler tests, to isolate a s390x failure

Author: spytheman

vlib/v/tests/generics/return_closure_f64_test.v

@@ -0,0 +1,20 @@
+fn vectorize(op fn (f64) f64) fn ([]f64) []f64 {
+	return fn [op] (values []f64) []f64 {
+		mut result := []f64{len: values.len}
+		for i in 0 .. values.len {
+			result[i] = op(values[i])
+		}
+		return result
+	}
+}
+
+fn add_one(x f64) f64 {
+	return x + 1
+}
+
+fn test_return_generic_closure_f64() {
+	vadd1 := vectorize(add_one)
+	v1 := [1.0, 2, 3, 4]
+	println(vadd1(v1))
+	assert vadd1(v1) == [2.0, 3, 4, 5]
+}

vlib/v/tests/generics/return_closure_int_test.v

@@ -0,0 +1,20 @@
+fn vectorize(op fn (int) int) fn ([]int) []int {
+	return fn [op] (values []int) []int {
+		mut result := []int{len: values.len}
+		for i in 0 .. values.len {
+			result[i] = op(values[i])
+		}
+		return result
+	}
+}
+
+fn add_one(x int) int {
+	return x + 1
+}
+
+fn test_return_generic_closure_int() {
+	vadd1 := vectorize(add_one)
+	v1 := [1, 2, 3, 4]
+	println(vadd1(v1))
+	assert vadd1(v1) == [2, 3, 4, 5]
+}