Looks alright, although I wouldn't call that thing a typo. Variable names in C++ doesn't have to match in function header and implementation, although, it's probably less confusing if they match. But sometimes one can simply omit names in header and just have types.

In D20269#444176, @stikonas wrote:

Looks alright, although I wouldn't call that thing a typo. Variable names in C++ doesn't have to match in function header and implementation, although, it's probably less confusing if they match. But sometimes one can simply omit names in header and just have types.

I Knew that, did not knew what to say that renaming so came up with a typo