How to use .symbolVariant(.contains: )

I'm getting a weird response from Xcode in trying to use symbolVariant(.contains). I also don't understand why it demands the type cast. What am I doing wrong?

Here's the code as text:

import SwiftUI

let Variants: [SymbolVariants] = [
  .circle,
  .square,
  .fill,
  .rectangle,
  .slash,
  .none
]

func varAvail(_ image: Image) -> [SymbolVariants] {
  var res: [SymbolVariants] = []
  for variant in Variants {
    if image.symbolVariant(.contains(variant)) as! Bool {
      res.append(variant)
    }
  }
}