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Add eprint! and eprintln! macros to the prelude. #41192

Merged
merged 4 commits into from
May 11, 2017
Merged

Add eprint! and eprintln! macros to the prelude. #41192

merged 4 commits into from
May 11, 2017

Commits on May 10, 2017

  1. Add eprint! and eprintln! macros to the prelude. 

    These are exactly the same as `print!` and `println!` except that
they write to stderr instead of stdout.  Issue rust-lang#39228.
    @zackw
    zackw committed May 10, 2017
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  2. Revise the eprint(ln)! feature. 

     * Factor out the nigh-identical bodies of `_print` and `_eprint` to a helper
   function `print_to` (I was sorely tempted to call it `_doprnt`).
 * Update the issue number for the unstable `eprint` feature.
 * Add entries to the "unstable book" for `eprint` and `eprint_internal`.
 * Style corrections to the documentation.
    @zackw
    zackw committed May 10, 2017
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  3. Fix up stability annotations per feedback.

    @zackw
    zackw committed May 10, 2017
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  4. Skip print-stdout-eprint-stderr test on emscripten

    @zackw
    zackw committed May 10, 2017
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