Closures fail when capturing parameters that are functions

[svelterust]

V version: V 0.2.4 4d4398f
OS: linux, "Arch Linux"

What did you do?
Try capturing functions from function parameter.

What did you expect to see?
No C error.

What did you see instead?
Didn't work. This causes a C error. There is a temporary workaround in the meantime.

For instance, if we have the following:

pub fn minimal(cond fn (int) bool) fn (int) bool {
	return fn [cond] (input int) bool {
		return cond(input)
	}
}

We get this:

~/source/vlang/parser $ v -cg .
/tmp/v_1000/parser.9950605039529488339.tmp.c:1914: warning: implicit declaration of function 'cond'
tcc: error: undefined symbol 'cond'

However, if we declare the parameter again inside the function body, it works:

pub fn minimal(cond fn (int) bool) fn (int) bool {
	functions := [cond]
	return fn [functions] (input int) bool {
		cond := functions[0]
		return cond(input)
	}
}

[spytheman]

The first minimal example now compiles.

pub fn minimal(cond fn (int) bool) fn (int) bool {
	return fn [cond] (input int) bool {
		return cond(input)
	}
}

fn main() {
	x := minimal(fn (i int) bool {
		if i < 10 {
			return false
		}
		return true
	})
	//
	dump(x(-5))
	dump(x(10))
	dump(x(20))
}

produces:

[zz.v:10] main.x(-5): false
[zz.v:11] main.x(10): true
[zz.v:12] main.x(20): true