String formatting and internationalization

[sanxiyn]

Currently format string of fmt! must be a string literal, but this can't be the case for internationalized applications "available in more than 70 languages" such as Mozilla Firefox.

[msullivan]

It looks like there has been some discussion on reworking fmt in ways that would facilitate this: https://mail.mozilla.org/pipermail/rust-dev/2013-May/003999.html

[msullivan]

And also https://github.com/mozilla/rust/wiki/Lib-fmt

[alexcrichton]

This is well under way with the ifmt! extension, but there are some large components missing so this isn't quite ready to be closed yet. The good news is that all the ground work is laid out with ifmt! and nothing should need a major redesign to take care of this. Figure I'd keep it updated.

[pzol]

Visiting for triage. This should go hand in hand with other internationalization efforts, including unicode handling. Is there more information available about ifmt! ?

[huonw]

ifmt became the current format println, etc: http://static.rust-lang.org/doc/master/std/fmt/index.html

[aturon]

Our internationalization/localization work is now under issues #14494 and #14495, which are not on the 1.0 milestone.