To reproduce, starting at the root of the Emacs source tree:

1. emacs -Q
2. M-x edebug-all-defs RET
3. C-x C-f test/lisp/jit-lock-tests.el RET
4. M-x eval-buffer RET

Result: invalid-read-syntax "Failed matching" (form)

Here's a one line patch that fixes it for me: