Repro steps: 1. Go to a type defined by a macro. [Here's](https://hyper.rs/hyper/master/hyper/header/struct.AcceptCharset.html) an example from Hyper. 1. Click "[src]" in the upper right **Expected:** Open source viewer at the macro invocation which defines this type. **Observed:** Open source viewer at the macro definition. <!-- TRIAGEBOT_START --> <!-- TRIAGEBOT_ASSIGN_START --> <!-- TRIAGEBOT_ASSIGN_DATA_START$${"user":"liketechnik"}$$TRIAGEBOT_ASSIGN_DATA_END --> <!-- TRIAGEBOT_ASSIGN_END --> <!-- TRIAGEBOT_END -->