Commits on Jan 26, 2018

1. Detect possibly non-Rust closure syntax during parse …

   Other languages have a similar, but not quite the same to Rust, syntax
   for closures:
   
   ```
   {|<args>| <stmts> }
   ```
   
   Even worse, the above code *is* valid Rust if and only if there's only
   one statement, as the block would resolve to the single statement
   closure within it. This means that seemingly correct code will fail when
   adding a new statement, making modifying something that looks unrelated
   cause "value not found in this scope" and "trait bound not satisfied"
   errors. Because of this, make the parser detect the specific case where
   the code is incorrect *and* failing, and emit a warning explaining the
   correct syntax.

   

   estebank committed Jan 26, 2018
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