Here is a pastebin for the error:
On my Macbook Pro when going forward holding the "w" key I then press "Ctrl" + click the trackpad (alternative to 2 finger on the trackpad right-click) and the game crashes.
MC-8249
Walking and Right Clicking Bug
Resolved
Duplicate
0
Andy Smith
(Unassigned)
Unconfirmed
Snapshot 13w04a
Retrieved
Duplicate of MC-8189, please use the search function to see if your bug has already been submitted. Currently over 49% of tickets are being closed as duplicate.