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use std::any::Any;
fn main()
{
fn h(x:i32) -> i32 {3*x}
let mut vfnfer:Vec<Box<dyn Any>> = vec![];
vfnfer.push(Box::new(h));
println!("{:?}",(vfnfer[0] as dyn Fn)(3));
//~^ ERROR the precise format of `Fn`-family traits'
//~| ERROR missing generics for trait `Fn`
//~| ERROR the value of the associated type `Output` (from trait `FnOnce`)
}
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