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use std::env::args;
use std::fs::File;
use std::io::{stdout, Write, BufWriter};
fn main() {
let mut args = args();
let _ = args.next();
let dest = args.next();
let h1; let h2; let h3;
let fp: &dyn Write = match dest {
Some(path) => { h1 = File::create(path).unwrap(); &h1 },
None => { h2 = stdout(); h3 = h2.lock(); &h3 }
};
let fp = BufWriter::new(fp);
//~^ ERROR the trait bound `&dyn std::io::Write: std::io::Write` is not satisfied
//~| ERROR the trait bound `&dyn std::io::Write: std::io::Write` is not satisfied
writeln!(fp, "hello world").unwrap(); //~ ERROR the method
}
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