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This work on r97026 and fails on r97032.
The console on r97032 reports:
TypeError: 'undefined' is not a function (evaluating 'c[l](0)')
It seems that Changeset r97030 is a likely candidate for this regression.
Webkit: Version 5.1 (6534.50, r97032)
Bug still exists in r97166.
Later bugreport 70094 (and fix) seems to address the problem
caused by r97030:
"DFG should not always speculate that a ByVal access has an integer index"
The problem reported by this bugreport is fixed as of nightly build r98825.
*** This bug has been marked as a duplicate of bug 70094 ***