`panic`, `env`, and `vec` macros missing from std API doc search results

[ashtneoi]

On stable (1.26.0), if I open the standard library API docs in my browser and search for one of the three strings panic, env, or vec, the search results include both the module and the macro by that name. Note that the module and the macro have the same path (std::panic, etc.).

On nightly 2018-05-25, those three macros no longer appear in search results, though their corresponding modules do. The macros still show up in the std crate index's macro list (std/index.html#macros). Since the macros and the modules have matching paths, it sounds like the macros are being shadowed somehow.

---

$ rustc --version --verbose
rustc 1.28.0-nightly (990d8aa74 2018-05-25)
binary: rustc
commit-hash: 990d8aa743b1dda3cc0f68fe09524486261812c6
commit-date: 2018-05-25
host: x86_64-unknown-linux-gnu
release: 1.28.0-nightly
LLVM version: 6.0

[ollie27]

Looks like this was caused by #50259. We need to take into account the type when de-duplicating results not just the full path. cc. @GuillaumeGomez

[GuillaumeGomez]

Oh indeed, I just fixed this issue for keywords so I'll fix it as well for macros.