DIP1000-related deprecation with DMD 2.101

[Herringway]

This code:

D-YAML/source/dyaml/node.d

Lines 2510 to 2522 in 9456888

	this.value_.match!(
	(const bool v) => formattedWrite(sink, v ? "true" : "false"),
	(const long v) => formattedWrite(sink, "%s", v),
	(const Node[] v) => formattedWrite(sink, "[%(%s, %)]", v),
	(const ubyte[] v) => formattedWrite(sink, "%s", v),
	(const string v) => formattedWrite(sink, `"%s"`, v),
	(const Node.Pair[] v) => formattedWrite(sink, "{%(%s, %)}", v),
	(const SysTime v) => formattedWrite(sink, "%s", v),
	(const YAMLNull v) => formattedWrite(sink, "%s", v),
	(const YAMLMerge v) => formattedWrite(sink, "%s", v),
	(const real v) => formattedWrite(sink, "%s", v),
	(const YAMLInvalid v) => formattedWrite(sink, "%s", v),
	);

gives us a deprecation warning - Deprecation: scope variable 'this' assigned to non-scope parameter '_param_0' calling 'match'. There are two problems that I can see here:

• the delegates handling references's parameters aren't marked scope
  • easy to fix. just add 'scope' to the delegate params
• formattedWrite's parameters aren't scope
  • needs to be fixed in phobos?