Set User.PackageIsLoaded to true

Usually set by endPackage, but that isn't called for User

M2/Macaulay2/m2/last.m2

@@ -39,6 +39,7 @@ addStartFunction(
 		   Headline       => "default package for interpreter interactions",
 		   DebuggingMode  => true,
 		   PackageImports => if isMember("--no-preload", commandLine) then {} else Core#"preloaded packages");
+	       User.PackageIsLoaded = true;
 	       path = prepend("./",path); -- now we search also the user's current directory, since our files have already been loaded
 	       path = unique apply( path, minimizeFilename);	    -- beautify
 	       allowLocalCreation User#"private dictionary";