> Seems like some extraneous function definition is being made for the calltip. 
> But it never appears in the symbol list.

Actually it does: when you don't have the `(` yet, the parser extracts 
`ns::C::f (junk, rubbish)`.  Apparently it's the `public:` part that confuses 
it the most, if you drop it you don't get the erroneous `f` function.  So yeah 
it's not great, but fixing that would require getting the parser not confused 
by this particular invalid input.

> And ... if there happen to be other functions named `f` the calltips will 
> cycle through the prototypes of those functions and never come back to the 
> erroneous one.

That's a "funny" side effect of the details of the issue: once you typed the 
`(`, the parser doesn't see a `f` any more; and when you cycle through the 
calltips, apparently (?) we query the possible candidates again, so at this 
point we don't find the erroneous `ns::C::f` as the parser doesn't report it 
anymore.

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