Build fails on `nightly-2021-04-11` with `runtime` feature enabled.

[EliaGeretto]

When building with the runtime feature enabled, several errors appear using the nightly from 2021-04-11. They all look like the following:

error[E0642]: patterns aren't allowed in methods without bodies
    --> src/lib.rs:1683:39
     |
1683 |     pub fn clang_CXCursorSet_contains(set: CXCursorSet, cursor: CXCursor) -> c_uint;
     |                                       ^^^
     |
help: give this argument a name or use an underscore to ignore it
     |
1683 |     pub fn clang_CXCursorSet_contains(_: CXCursorSet, cursor: CXCursor) -> c_uint;
     |                                       ^

I am not sure whether this is a compiler regression or not, so I bisected rustc and concluded that this PR seems to have introduced the issue. I thought it was still worth reporting the problem here so the maintainer of this repo can verify himself if he can reproduce the issue.

[EliaGeretto]

The problem should be reproducible with cargo build --features 'runtime'.

[EliaGeretto]

A fix is on the way: rust-lang/rust#84130

[EliaGeretto]

This issue has been fixed in master, the fix has been merged.