Commits on Nov 1, 2018

1. std: Enable usage of thread_local! through imports …

   The `thread_local!` macro delegated to an internal macro but it didn't
   do so in a macros-and-the-module-system compatible fashion, meaning if a
   `#![no_std]` crate imported `std` and tried to use `thread_local!` it
   would fail due to missing a lookup of an internal macro.
   
   This commit switches the macro to instead use `$crate` to invoke other
   macros, ensuring that it'll work when `thread_local!` is imported alone.

   

   alexcrichton committed Nov 1, 2018
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