capitaomorte/yasnippet — pull request #524 by npostavs (2014-10-05 00:57:09+00:00)
Title: Signal an error on recursive yas--fallback calls

* yasnippet.el (yas--fallback): let-bind yas-fallback-behavior to
'yas--fallback before actually doing the fallback. Signal an error if
it's 'yas--fallback (indicating we're in an infinte loop).

Following discussion in #457.