verify that Python raises SyntaxError for long and deeply-nested expressions

Lib/test/output/test_longexp

+test_longexp
+Caught SyntaxError for long expression: expression too long

Lib/test/test_longexp.py

+REPS = 8192
+
+try:
+    eval("2+2+" * REPS + "+3.14159265")
+except SyntaxError, msg:
+    print "Caught SyntaxError for long expression:", msg
+else:
+    print "Long expression did not raise SyntaxError"
+
+## This test prints "s_push: parser stack overflow" on stderr,
+    ## which seems to confuse the test harness
+##try:
+##    eval("(2+" * REPS + "0" + ")" * REPS)
+##except SyntaxError:
+##    pass
+##else:
+##    print "Deeply nested expression did not raised SyntaxError"
+