Describe the bug

We have an array of arrays rows = [][]string{} and push a not defined empty array rows << [ ] and got a C error.

Operation rows << [ ] is not marked as invalid.

A workaround is to push like this: rows << []string{}.

Reproduction Steps

fn one(mut rows [][]string) {
	rows << [ '1a', '1b' ]
}

fn two(empty bool, mut rows [][]string) {
	if empty {
		rows << [ ] // C error
		//rows << []string{} // workaround
	} else {
		rows << [ '2a', '2b' ]
	}
}

fn main() {
	mut rows := [][]string{}
	one(mut rows)
	two(true, mut rows)
	println(rows)
}

Expected Behavior

Print:

[['1a', '1b'], []]

Or inform rows << [] should be changed by row << []string{}

Current Behavior

Running code...
Can't run code. The server returned an error:
/tmp/v_60000/../../../../../../box/code.v:7: error: pointer expected
builder error: 
==================
C error found. It should never happen, when compiling pure V code.

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.9 a59ebea

Environment details (OS name and version, etc.)

https://play.vlang.io/p/734e07e5c5