Undefined reference link error after successful compile

[jminer]

The following code compiles without error but gives a link error:

https://github.com/jminer/clear-coat/tree/link-error

Further attempts to reduce it have made the error go away, but someone else can probably get it a lot shorter. To reproduce the error, run cargo run --example basic_controls in the link-error branch. In the full code, I have a couple other methods in CallbackRegistry that work fine, but if I try to use remove_callback, I get a link error. Here's the error:

note: C:\Files\Projects\clear-coat\target\debug\examples\basic_controls.0.o: In function `ZN14basic_controls16common_callbacks19CallbackRegistry<F>15remove_callbackE':
c:\Files\Projects\clear-coat/<std macros>:6: undefined reference to `common_callbacks::CallbackRegistry$LT$F$GT$::remove_callback::_FILE_LINE::hdeeab2d67af13153Cba'
c:\Files\Projects\clear-coat/<std macros>:3: undefined reference to `common_callbacks::CallbackRegistry$LT$F$GT$::remove_callback::_FILE_LINE::hdeeab2d67af13153Cba'

I'm using rustc 1.7.0-nightly (b4707eb 2015-12-27) 32-bit GNU on 64-bit Windows 7.

Issue #17610 is another link error, but I don't know if it is the same cause.

[nagisa]

Most likely a dupe of #20201 which is a dupe of #16734.

[jminer]

Thanks, the explanation in #20201 was helpful. I tried reexporting the type and that fixed it. I agree it is a dupe of #16734, so I'll close this one.