Commits on Aug 18, 2021

1. Add dbg! macro from Rust standard library …

   The Rust standard library has a really handy macro, `dbg!`. It prints
   the source location (filename and line) along with the raw source code
   that is is invoked with and the `Debug` representation of the given
   expression. This patch ports the macro over to the kernel crate.
   
   For use in the kernel, we don't print with `eprintln!` (stderr),
   but `pr_info!`.
   
   Since the source code for the macro is taken from the standard library
   source (with only minor adjustments), the designated file
   (`std_vendor.rs`) is licensed under "Apache 2.0 OR MIT", just like its
   origin. This is the same approach as with the vendored `alloc` crate.
   
   Signed-off-by: Niklas Mohrin <dev@niklasmohrin.de>

   

   niklasmohrin committed Aug 18, 2021
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