Intro

println!

use std::fs::File;

fn main() {
    let x = File::open("nop");
    println!("{:?}", x);
    println!("");
    println!("{:#?}", x);
}

format!

write!

try!

undefined!

assert!

assert_eq!

panic!

unreachable!

unimplemented!

column!

line!

file!

vec!

log_syntax!

trace_macros!


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