rustfmt-nightly 1.4.21

Tool to find and fix Rust formatting issues
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// Preserve two trailing whitespaces in doc comment,
// but trim any whitespaces in normal comment.

//! hello world  
//! hello world

/// hello world    
/// hello world
/// hello world  
fn foo() {
    // hello world
    // hello world
    let x = 3;
    println!("x = {}", x);
}