Merge branch 'master' into master

Author: BuggusMageevers

swift/Sources/Lexer/Lexer.swift

@@ -23,14 +23,11 @@ extension String {
 }
 
 struct Lexer {
-    var input: String = ""
+    var input: String
     private var currentIndex: String.Index
     private var currentChar: Character { input[currentIndex] }
     private var keywords: [String : Token] = Token.defaultKeywords
 
-    init() {
-        self.currentIndex = input.startIndex
-    }
     init(input: String) {
         self.input = input
         self.currentIndex = input.startIndex