note: trace_macro
  --> $DIR/trace-macro.rs:15:5
   |
15 |     println!("Hello, World!");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: expanding `println! { "Hello, World!" }`
   = note: to `print ! ( concat ! ( "Hello, World!" , "/n" ) )`
   = note: expanding `print! { concat ! ( "Hello, World!" , "/n" ) }`
   = note: to `$crate :: io :: _print ( format_args ! ( concat ! ( "Hello, World!" , "/n" ) )
           )`