[yuyi98]

This PR fix generic fn returning generic closure (fix #23035).

• Fix generic fn returning generic closure.
• Add test.

fn vectorize[T](op fn (T) T) fn ([]T) []T {
	return fn [op] [T](values []T) []T {
		mut result := []T{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 main() {
	vadd := vectorize[f64](add_one)
	v := [1.0, 2, 3, 4]
	println(vadd(v))
	assert vadd(v) == [2.0, 3, 4, 5]
}

PS D:\Test\v\tt1> v run .
[2.0, 3.0, 4.0, 5.0]

_{Huly®: V_0.6-21487}

[spytheman]

Excellent work.

[spytheman]

will that allow for returning closures, that do not match the signature as well?

[yuyi98]

Yes, It need to check more.

[thesombady]

Great work! A neat fix!