Commits on Jan 28, 2017

1. Add clearer error message using &str + &str …

   This is the first part of #39018. One of the common things for new users
   coming from more dynamic languages like JavaScript, Python or Ruby is to
   use `+` to concatenate strings. However, this doesn't work that way in
   Rust unless the first type is a `String`. This commit adds a check for
   this use case and outputs a new error as well as a suggestion to guide
   the user towards the desired behavior. It also adds a new test case to
   test the output of the error.

   

   mgattozzi committed Jan 28, 2017
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