note: trace_macro
  --> $DIR/trace-macro.rs:15:5
   |
LL |     println!("Hello, World!");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: expanding `println! { "Hello, World!" }`
   = note: to `{
           # [ cfg ( not ( stage0 ) ) ] {
           ( $crate :: io :: _print ( format_args_nl ! ( "Hello, World!" ) ) ) ; } # [
           cfg ( stage0 ) ] { print ! ( "{}/n" , format_args ! ( "Hello, World!" ) ) } }`