Commits on Jun 26, 2020

1. Don't pollute docs/suggestions with libstd deps …

   Currently dependency crates of the standard library can sometimes leak
   into error messages such as when traits to import are suggested.
   Additionally they can leak into documentation such as in the list of
   "all traits implemented by `u32`". The dependencies of the standard
   library, however, are intended to be private.
   
   The dependencies of the standard library can't actually be stabl-y
   imported nor is the documentation that relevant since you can't import
   them on stable either. This commit updates both the compiler and rustdoc
   to ignore unstable traits in these two scenarios.
   
   Specifically the suggestion for traits to import ignore unstable traits,
   and similarly the list of traits implemented by a type excludes unstable
   traits.
   
   This commit is extracted from rust-lang#73441 where the addition of some new
   dependencies to the standard library was showed to leak into various
   error messages and documentation. The intention here is to go ahead and
   land these changes ahead of that since it will likely take some time to
   land.

   

   alexcrichton committed Jun 26, 2020
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