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rustc: infinite loop print compile errors when compiling macros #12464

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@liigo

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@liigo
fn main() {
    println!(format!("{}",123));
}

When compiled, rustc will prints:

macro.c:12:11: 12:17 error: macro undefined: 'format'
macro.c:12  println!(format!("{}",123));
                     ^~~~~~
macro.c:12:11: 12:17 error: macro undefined: 'format'
macro.c:12  println!(format!("{}",123));
                     ^~~~~~
macro.c:12:11: 12:17 error: macro undefined: 'format'
macro.c:12  println!(format!("{}",123));
                     ^~~~~~
macro.c:12:11: 12:17 error: macro undefined: 'format'
macro.c:12  println!(format!("{}",123));
                     ^~~~~~
macro.c:12:11: 12:17 error: macro undefined: 'format'
macro.c:12  println!(format!("{}",123));
............

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