Commits on Jan 28, 2021

1. Add SEMICOLON_IN_EXPRESSIONS_FROM_MACROS lint …

   cc rust-lang#79813
   
   This PR adds an allow-by-default future-compatibility lint
   `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS`. It fires when a trailing semicolon in a
   macro body is ignored due to the macro being used in expression
   position:
   
   ```rust
   macro_rules! foo {
       () => {
           true; // WARN
       }
   }
   
   fn main() {
       let val = match true {
           true => false,
           _ => foo!()
       };
   }
   ```
   
   The lint takes its level from the macro call site, and
   can be allowed for a particular macro by adding
   `#[allow(semicolon_in_expressions_from_macros)]`.
   
   The lint is set to warn for all internal rustc crates (when being built
   by a stage1 compiler). After the next beta bump, we can enable
   the lint for the bootstrap compiler as well.

   

   Aaron1011 committed Jan 28, 2021
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