hal::match now takes multiple arguments

Resolves #695

Author: Khalil Estell

include/libhal/error.hpp

@@ -21,8 +21,8 @@
 
 namespace hal {
 
-template<typename T, T value>
-using match = boost::leaf::match<T, value>;
+template<typename T, T... value>
+using match = boost::leaf::match<T, value...>;
 template<class T>
 using result = boost::leaf::result<T>;
 using status = result<void>;