Work around macro context cache issue.

src/tink/MacroApi.hx

@@ -3,6 +3,7 @@ package tink;
 import haxe.macro.Expr.TypeDefinition;
 
 using tink.CoreApi;
+using tink.macro.Positions;
 
 typedef Positions = tink.macro.Positions;
 typedef ExprTools = haxe.macro.ExprTools;
@@ -41,7 +42,13 @@ class MacroApi {
 	static function get_typeNotFound() {
 		if (typeNotFound == null) {
 			var trigger = Signal.trigger();
-			haxe.macro.Context.onMacroContextReused(function () return false);
+			
+			var listening = false;
+			
+			function register() {
+				if (listening) return;
+				listening = true;
+				
 				haxe.macro.Context.onTypeNotFound(function (name:String) {
 					@:privateAccess Positions.errorFunc = @:privateAccess Positions.abortTypeBuild;
 					
@@ -66,8 +73,20 @@ class MacroApi {
 						default: null;
 					}
 				});
+			}
 			
-			typeNotFound = trigger.asSignal();
+			register();
+			
+			haxe.macro.Context.onMacroContextReused(function () {
+				listening = false;
+				return true;
+			});
+			
+			var ret = trigger.asSignal();
+			typeNotFound = new Signal(function (cb) {
+				register();
+				return ret.handle(cb);
+			});
 		}
 		return typeNotFound;
 	}