--pdb does not work when collecting

[pytestbot]

Originally reported by: Armin Rigo (BitBucket: arigo, GitHub: arigo)

---

"py.test --pdb" ignores the --pdb option for crashes that occur during collect. Try to run "py.test --pdb test_foo.py" with only the line "crash_here" in test_foo.py.

---

• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/181

[pytestbot]

Original comment by Armin Rigo (BitBucket: arigo, GitHub: arigo):

---

platform linux2 -- Python 2.7.3 -- pytest-2.2.4

[pytestbot]

Original comment by holger krekel (BitBucket: hpk42, GitHub: hpk42):

---

• fix issue181: --pdb now also works on collect errors. This was
  implemented by a slight internal refactoring and the introduction
  of a new hook pytest_exception_interact hook.
• fix issue341: introduce new experimental hook for IDEs/terminals to
  intercept debugging: pytest_exception_interact(node, call, report).