Commits on Sep 9, 2021

1. Emit proper errors on missing closure braces …

   This commit focuses on emitting clean errors for the following syntax
   error:
   
   ```
   Some(42).map(|a|
       dbg!(a);
       a
   );
   ```
   
   Previous implementation tried to recover after parsing the closure body
   (the `dbg` expression) by replacing the next `;` with a `,`, which made
   the next expression belong to the next function argument. As such, the
   following errors were emitted (among others):
     - the semicolon token was not expected,
     - a is not in scope,
     - Option::map is supposed to take one argument, not two.
   
   This commit allows us to gracefully handle this situation by adding
   giving the parser the ability to remember when it has just parsed a
   closure body inside a function call. When this happens, we can treat the
   unexpected `;` specifically and try to parse as much statements as
   possible in order to eat the whole block. When we can't parse statements
   anymore, we generate a clean error indicating that the braces are
   missing, and return an ExprKind::Err.

   Sasha Pourcelot committed Sep 9, 2021
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