Add test case for bug fixed in 8d4860b5bd

I.e. this test case verifies that recursive rules marked for expansion
*don't* cause stackoverflow when PLY debugging is enabled.

Signed-off-by: Giel van Schijndel <giel.van.schijndel@asml.com>
Merge pull request #10 from muggenhor/inplace-expansion-for-recursive-rules

Add test case for bug fixed in 8d4860b5bd