Fix Xcode 10b / Swift 4.2 compiler issue (type-checker timeout)

CHANGELOG.md

@@ -9,6 +9,9 @@
 * Fixed using filter expression in call node.  
   [Ilya Puchka](https://github.com/ilyapuchka) 
   [#85](https://github.com/SwiftGen/StencilSwiftKit/pull/85)
+* Fixed compilation issue with Xcode 10 & Swift 4.2 by adding hints to help the compiler.  
+  [Olivier Halligon](https://github.com/AliSoftware) 
+  [#93](https://github.com/SwiftGen/StencilSwiftKit/pull/93)
 
 ### Breaking Changes
 

Sources/SwiftIdentifier.swift

@@ -6,34 +6,71 @@
 
 import Foundation
 
-private func mr(_ char: Int) -> CountableClosedRange<Int> {
+typealias CharRange = CountableClosedRange<Int>
+
+private func mr(_ char: Int) -> CharRange {
   return char...char
 }
 
 // Official list of valid identifier characters
 // swiftlint:disable:next line_length
 // from: https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/LexicalStructure.html#//apple_ref/doc/uid/TP40014097-CH30-ID410
-private let headRanges: [CountableClosedRange<Int>] = [
-  0x61...0x7a, 0x41...0x5a, mr(0x5f), mr(0xa8), mr(0xaa), mr(0xad), mr(0xaf),
-  0xb2...0xb5, 0xb7...0xba, 0xbc...0xbe, 0xc0...0xd6, 0xd8...0xf6, 0xf8...0xff,
-  0x100...0x2ff, 0x370...0x167f, 0x1681...0x180d, 0x180f...0x1dbf,
-  0x1e00...0x1fff, 0x200b...0x200d, 0x202a...0x202e, mr(0x203F), mr(0x2040),
-  mr(0x2054), 0x2060...0x206f, 0x2070...0x20cf, 0x2100...0x218f, 0x2460...0x24ff,
-  0x2776...0x2793, 0x2c00...0x2dff, 0x2e80...0x2fff, 0x3004...0x3007,
-  0x3021...0x302f, 0x3031...0x303f, 0x3040...0xd7ff, 0xf900...0xfd3d,
-  0xfd40...0xfdcf, 0xfdf0...0xfe1f, 0xfe30...0xfe44, 0xfe47...0xfffd,
-  0x10000...0x1fffd, 0x20000...0x2fffd, 0x30000...0x3fffd, 0x40000...0x4fffd,
-  0x50000...0x5fffd, 0x60000...0x6fffd, 0x70000...0x7fffd, 0x80000...0x8fffd,
-  0x90000...0x9fffd, 0xa0000...0xafffd, 0xb0000...0xbfffd, 0xc0000...0xcfffd,
-  0xd0000...0xdfffd, 0xe0000...0xefffd
+private let headRanges: [CharRange] = [
+  0x61...0x7a as CharRange,
+  0x41...0x5a as CharRange,
+  mr(0x5f), mr(0xa8), mr(0xaa), mr(0xad), mr(0xaf),
+  0xb2...0xb5 as CharRange,
+  0xb7...0xba as CharRange,
+  0xbc...0xbe as CharRange,
+  0xc0...0xd6 as CharRange,
+  0xd8...0xf6 as CharRange,
+  0xf8...0xff as CharRange,
+  0x100...0x2ff as CharRange,
+  0x370...0x167f as CharRange,
+  0x1681...0x180d as CharRange,
+  0x180f...0x1dbf as CharRange,
+  0x1e00...0x1fff as CharRange,
+  0x200b...0x200d as CharRange,
+  0x202a...0x202e as CharRange,
+  mr(0x203F), mr(0x2040), mr(0x2054),
+  0x2060...0x206f as CharRange,
+  0x2070...0x20cf as CharRange,
+  0x2100...0x218f as CharRange,
+  0x2460...0x24ff as CharRange,
+  0x2776...0x2793 as CharRange,
+  0x2c00...0x2dff as CharRange,
+  0x2e80...0x2fff as CharRange,
+  0x3004...0x3007 as CharRange,
+  0x3021...0x302f as CharRange,
+  0x3031...0x303f as CharRange,
+  0x3040...0xd7ff as CharRange,
+  0xf900...0xfd3d as CharRange,
+  0xfd40...0xfdcf as CharRange,
+  0xfdf0...0xfe1f as CharRange,
+  0xfe30...0xfe44 as CharRange,
+  0xfe47...0xfffd as CharRange,
+  0x10000...0x1fffd as CharRange,
+  0x20000...0x2fffd as CharRange,
+  0x30000...0x3fffd as CharRange,
+  0x40000...0x4fffd as CharRange,
+  0x50000...0x5fffd as CharRange,
+  0x60000...0x6fffd as CharRange,
+  0x70000...0x7fffd as CharRange,
+  0x80000...0x8fffd as CharRange,
+  0x90000...0x9fffd as CharRange,
+  0xa0000...0xafffd as CharRange,
+  0xb0000...0xbfffd as CharRange,
+  0xc0000...0xcfffd as CharRange,
+  0xd0000...0xdfffd as CharRange,
+  0xe0000...0xefffd as CharRange
 ]
 
-private let tailRanges: [CountableClosedRange<Int>] = [
+private let tailRanges: [CharRange] = [
   0x30...0x39, 0x300...0x36F, 0x1dc0...0x1dff, 0x20d0...0x20ff, 0xfe20...0xfe2f
 ]
 
 private func identifierCharacterSets(exceptions: String) -> (head: NSMutableCharacterSet, tail: NSMutableCharacterSet) {
-  let addRange: (NSMutableCharacterSet, CountableClosedRange<Int>) -> Void = { mcs, range in
+  let addRange: (NSMutableCharacterSet, CharRange) -> Void = { mcs, range in
     mcs.addCharacters(in: NSRange(location: range.lowerBound, length: range.count))
   }