The mini demo as follow.
struct home: View {
		@State var 😄 = false
		var body: some View {
				// '$' is not an identifier; use backticks to escape it
				// Cannot find '$' in scope
				FooView(bar: $😄)
		}
}
struct FooView: View {
@Binding var bar: Bool
	// ...
}
That would be normal when use ASCII character to replace emoji.
Eriice
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If you can open source the code in this video, it will be a great help for learning this interface