Moved error message to case class scheme

[gvolpe]

Moved anonymous function missing parameter type error message to case class scheme.

Corresponds to Typer.scala:770 listed on the main issue: #1589

[dottybot]

Hello, and thank you for opening this PR! 🎉

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Commit Messages

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Please stick to these guidelines for commit messages:

1. Separate subject from body with a blank line
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adapted from https://chris.beams.io/posts/git-commit

Have an awesome day! ☀️

[felixmulder]

Some minor nitpicks, otherwise LGTM! 🎉

• The commit message should be changed to something like: Move "Anonymous function missing param type" message to new error message scheme
• The PR needs to be rebased to master, I do this by:

  $ git remote add upstream git@github.com:lampepfl/dotty
  $ git fetch upstream master && git rebase -i upstream/master
  $ git push -f

[felixmulder]

For syntax highlighting this needs to be wrapped:

+           |${"val f = { case xs @ List(1, 2, 3) => Some(xs) }"}
-           |val f = { case l@List(1,2,3) => Some(l) }

Some spaces would also be awesome! 👍

[felixmulder]

Same here with the wrapping :)

[gvolpe]

Thanks @felixmulder , I'll try to fix it now in my lunch time :)

[gvolpe]

Hi @felixmulder , see if now it's fine whenever you can.
Cheers!

[felixmulder]

Cool, thanks @gvolpe! 🎉