Commits on Dec 25, 2019

1. Deprecate Error::description for real …

   `description` has been documented as soft-deprecated since 1.27.0 (17
   months ago). There is no longer any reason to call it or implement it.
   
   This commit:
   
   - adds #[rustc_deprecated(since = "1.41.0")] to Error::description;
   
   - moves description (and cause, which is also deprecated) below the
     source and backtrace methods in the Error trait;
   
   - reduces documentation of description and cause to take up much less
     vertical real estate in rustdocs, while preserving the example that
     shows how to render errors without needing to call description;
   
   - removes the description function of all *currently unstable* Error
     impls in the standard library;
   
   - marks #[allow(deprecated)] the description function of all *stable*
     Error impls in the standard library;
   
   - replaces miscellaneous uses of description in example code and the
     compiler.

   

   dtolnay committed Dec 25, 2019
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