Poor error message when forgetting the bang in a macro.

[Ms2ger]

fn main() {
    for i in 1..10 {
        println("{}", i);
    }
}

yields (on playpen):

<anon>:3:9: 3:16 error: unresolved name `println`. Did you mean `iter`?
<anon>:3         println("{}", i);
                 ^~~~~~~
error: aborting due to previous error
playpen: application terminated with error code 101

which is not helpful.

[nagisa]

This is a bit towards E-hard, because macro expansion and name resolution happen in two different places and we do not retain much macro-related information by the time resolve happens. That is, you’d need to reconstruct a list of all macro names from scratch when an error happens to suggest something here.

[sfackler]

Might be worth special casing println though, since it's so common. (Maybe try and vec as well?)

[Manishearth]

#5780

[Manishearth]

#29968