Python: Add example of re.compile missing points-to

Author: RasmusWL

python/ql/test/library-tests/PointsTo/regressions/missing/re-compile/Test.expected

@@ -0,0 +1 @@
+| test.py:5:7:5:13 | ControlFlowNode for PATTERN | <MISSING pointsTo()> |

python/ql/test/library-tests/PointsTo/regressions/missing/re-compile/Test.ql

@@ -0,0 +1,10 @@
+import python
+
+from NameNode name, CallNode call, string debug
+where
+    call.getAnArg() = name and
+    call.getFunction().(NameNode).getId() = "check" and
+    if exists(name.pointsTo())
+    then debug = name.pointsTo().toString()
+    else debug = "<MISSING pointsTo()>"
+select name, debug

python/ql/test/library-tests/PointsTo/regressions/missing/re-compile/test.py

@@ -0,0 +1,5 @@
+import re
+
+PATTERN = re.compile("a|b")
+
+check(PATTERN)