yihui/knitr — pull request #504 by jtoloe (2013-03-17 09:49:39+00:00)
Title: knit() should no longer output to a file in child_mode()

Since 7d741e76dc6b3b58308c0bc6215091daf39cbae1 child documents are supposed to be directly appended to the final document and not \input'ed from external files. This commit prevents the external files from being written.