Commits on May 13, 2018

1. Macros: Add a 'literal' fragment specifier …

   Implements RFC 1576.
   
   See: https://github.com/rust-lang/rfcs/blob/master/text/1576-macros-literal-matcher.md
   
   Changes are mostly in libsyntax, docs, and tests. Feature gate is
   enabled for 1.27.0.
   
   Many thanks to Vadim Petrochenkov for following through code reviews
   and suggestions.
   
   Example:
   
   ````rust
   
   macro_rules! test_literal {
       ($l:literal) => {
           println!("literal: {}", $l);
       };
       ($e:expr) => {
           println!("expr: {}", $e);
       };
   }
   
   fn main() {
       let a = 1;
       test_literal!(a);
       test_literal!(2);
       test_literal!(-3);
   }
   ```
   
   Output:
   
   ```
   expr: 1
   literal: 2
   literal: -3
   ```

   

   da-x committed May 13, 2018
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