swift234

Disallow 'var' pattern bindings in if, while, and guard statements

Make the following patterns illegal:

  if var x = ... {
    ...
  }

  guard var x = ... else {
    ...
  }

  while var x = ... {
    ...
  }

And provide a replacement fixit 'var' -> 'let'.

rdar://problem/23172698

Swift SVN r32855