show how to query symbols exported by a module

Author: gfldex

doc/Language/modules.pod6

@@ -302,6 +302,21 @@ L<Cool>s.
     say 0?, 1?, {}?, { a => "b" }?; # False True False True
     =end code
 
+=head2 Introspection
+
+To list exported symbols of a module first query the export tags supported by
+the module.
+
+    use URI::Escape;$
+    dd URI::Escape::EXPORT::.keys;$
+    # OUTPUT«("DEFAULT", "ALL").Seq»
+
+Then use the tag you like and pick the symbol by it's name.
+
+    dd URI::Escape::EXPORT::DEFAULT::.keys;
+    # OUTPUT«("\&uri-escape", "\&uri_escape", "\&uri-unescape", "\&uri_unescape").Seq»
+    my &escape-uri = URI::Escape::EXPORT::DEFAULT::<&uri_escape>;
+
 =head2 Finding Modules
 
 A user may have a collection of modules not found in the normal