Cant follow symbol under cursor if code is "little wrong"

Steps to reproduce

1. create new widget app
2. open mainwindow.cpp
3. put comma after 'this' as on screenshot
4. no way to follow inside 'setupUi'

you may say that 'code is wrong', but that happens every time then edit code, for example i forgot parameters to function and want to see inside? but cant do this without fixing code

if it is not a bug, but very annoying (

another 'wrong code' is:
1. add same 'case' in 'switch' (want to add another new cases with copy\paste)
2. no way to 'follow' in existing 'cases'