mutable params struct not optional as function argument

[ttytm]

Describe the bug

module main

@[params]
struct Params {
mut:
	a bool
}

fn foo(mut opts Params) {
	// ... processing, goal is to eventually have it accessible inside the function, recursively using it.
	// opts.a = true
	// foo(opts)
	println('')
}

fn main() {
	foo()
	// Below works.
	// mut p := Params{a: 1}
	// foo(mut p)

}

Reproduction Steps

above

Expected Behavior

params optionally passing params struct

Current Behavior

error: function `foo` parameter `opts` is `mut`, so use `mut Params{....}` instead
    1 | module main
      | ^
    2 | 
    3 | @[params]

Possible Solution

No response

Additional Information/Context

No response

V version

v0.4.5

Environment details (OS name and version, etc.)

linux, amd64

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