Try this:
    
    
    {.emit: """/*TYPESECTION*/
    class Foo{};
    """.}
    
    type Foo {.importcpp: "Foo", nodecl.} = object
    
    proc hello(_: Foo) = echo "Hello"
    
    proc foo (call: proc(_: Foo)) =
      call Foo()
    
    foo hello
    

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