document AST

(masak, please proof-read and augment)

Author: moritz

lib/AST.pod

@@ -0,0 +1,13 @@
+=begin pod
+
+    class AST { }
+
+An C<AST> or I<Abstract Syntax Tree> is a partially processed representation
+of a program. ASTs are return values of the C<quasi> quoting construct,
+and are typically used withing macros to generate code that is inserted
+in the calling location of the macro.
+
+There is no API defined for ASTs yet. Hopefully that will emerge as
+part of the work on macros.
+
+=end pod