Clang-sys does not build on rust 1.53 Nightly

[ubamrein]

I was building some library, which depended on clang-sys but it fails on rustc 1.53.0-nightly (d0695c908 2021-04-12) with a lot of error messages. When looking for the error, old issues from 2017 come up, related to rustc-serialize.

A prototypical example of the hundreds of errors:

error[E0642]: patterns aren't allowed in methods without bodies
    --> /Users/test/.cargo/registry/src/github.com-1ecc6299db9ec823/clang-sys-1.2.0/src/lib.rs:1966:37
     |
1966 |     pub fn clang_findIncludesInFile(tu: CXTranslationUnit, file: CXFile, cursor: CXCursorAndRangeVisitor) -> CXResult;
     |                                     ^^
     |
help: give this argument a name or use an underscore to ignore it
     |
1966 |     pub fn clang_findIncludesInFile(_: CXTranslationUnit, file: CXFile, cursor: CXCursorAndRangeVisitor) -> CXResult;

Meta

This bug only happens on nightly.

rustc --version --verbose:

rustc 1.53.0-nightly (d0695c908 2021-04-12)
binary: rustc
commit-hash: d0695c9081b16077d0aed368bccaf437d77ff497
commit-date: 2021-04-12
host: x86_64-apple-darwin
release: 1.53.0-nightly
LLVM version: 12.0.0

I also created an issue here KyleMayes/clang-sys#130, since I'm not sure, where the error is coming from.

[Urgau]

cc #84162
Fixed by #84130