Commits on Nov 11, 2016

1. Add foreign formatting directive detection. …

   This teaches `format_args!` how to interpret format printf- and
   shell-style format directives.  This is used in cases where there are
   unused formatting arguments, and the reason for that *might* be because
   the programmer is trying to use the wrong kind of formatting string.
   
   This was prompted by an issue encountered by simulacrum on the #rust IRC
   channel.  In short: although `println!` told them that they weren't using
   all of the conversion arguments, the problem was in using printf-syle
   directives rather than ones `println!` would undertand.
   
   Where possible, `format_args!` will tell the programmer what they should
   use instead.  For example, it will suggest replacing `%05d` with `{:0>5}`,
   or `%2$.*3$s` with `{1:.3$}`.  Even if it cannot suggest a replacement,
   it will explicitly note that Rust does not support that style of directive,
   and direct the user to the `std::fmt` documentation.

   

   DanielKeep committed Nov 11, 2016
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