When I use dump() I'd like to be able to tell where was it called at.

It's not difficult to add to output and I'd like to contribute it if approved by community.

The issue is not to add it to the output, but to determine these file and line. The only way (AFAIK) is to use debug_backtrace and then to extract a meaningful location from it (which is not easy, as the meaningful layer is often not the first one, due to the dump() function wrapper or the Twig integration layer)

Please note that this information is shown when dumping to the web dev toolbar.

@stof That's correct, I intended to use debug_backtrace() for this task.
@wouterj I use dumper with Silex and without a debug bar.