[macOS 10.9] Build script `panic!`s with `'main' panicked at 'function not loaded: clang_Type_getNumTemplateArguments'`

[mitchmindtree]

One of our workshop members ran into this bug last night:

error: failed to run custom build command for `coreaudio-sys v0.2.2`
process didn't exit successfully: `/Users/disuba/nannou/target/release/build/coreaudio-sys-8c91f3c1127ded1c/build-script-build` (exit code: 101)
--- stdout
cargo:rustc-link-lib=framework=AudioUnit
cargo:rustc-link-lib=framework=CoreAudio

--- stderr
thread 'main' panicked at 'function not loaded: clang_Type_getNumTemplateArguments', /Users/disuba/.cargo/registry/src/github.com-1ecc6299db9ec823/clang-sys-0.21.2/src/lib.rs:1456:1
note: Run with `RUST_BACKTRACE=1` for a backtrace.

warning: build failed, waiting for other jobs to finish...
error: build failed

I didn't get a lot of time to dig more into the error with them, however I just thought I'd post this here for now in case another user comes across the same issue with more info.

The user said they were running OSX 10.9.

[mitchmindtree]

Perhaps this recent-ish commit in rust-bindgen could be related? Perhaps the solution to this particular bug is simply updating bindgen from 0.32 to the current version 0.37?