SE-0235: Add Result to the Standard Library

Author: dwarfland

Source/Errors.swift

@@ -0,0 +1,5 @@
+public typealias Error = Exception
+
+public enum Result<Value, Error: Swift.Error> {
+	case value(Value), error(Error)
+}

Source/Swift.Shared.projitems

@@ -93,6 +93,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Array.Java.swift" />
     <Compile Include="$(MSBuildThisFileDirectory)Dictionary.Java.swift" />
     <Compile Include="$(MSBuildThisFileDirectory)Operators.swift" />
+    <Compile Include="$(MSBuildThisFileDirectory)Errors.swift" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Sequences">