Detecting version of Swift

[norio-nomura]

I think following behaviors are usable:

$ TOOLCHAINS=com.apple.dt.toolchain.Swift_2_3 sourcekitten syntax --text "#sourceLocation()"
[
  {
    "offset" : 1,
    "length" : 14,
    "type" : "source.lang.swift.syntaxtype.identifier"
  }
]
$ TOOLCHAINS=com.apple.dt.toolchain.XcodeDefault sourcekitten syntax --text "#sourceLocation()"
[
  {
    "offset" : 0,
    "length" : 15,
    "type" : "source.lang.swift.syntaxtype.keyword"
  }

[norio-nomura]

We can implement disabling rules that are needless on Swift 3 such as #701

[norio-nomura]

Are there any rules that we should disable on Swift 3 other than conditional_binding_cascade ?

[norio-nomura]

related to #700

[AliSoftware]

The rule telling the enum cases to be TitleCamelCased (instead of lowerCamelCased) is probably concerned too (type_name iirc). Wouldn't completely disable it though, just amend it to not consider case foo to be concerned by type_name (as a case is considered an instance property, and not a type, by the Swift 3 naming conventions)

[marcelofabri]

This was implemented on #1081. Thanks @norio-nomura for finding these behaviors!