Unable to generate bindings for when the _Atomic type qualifier is used

I've been having a few issues with a library since it started to use the _Atomic type qualifier.

Input C/C++ Header

extern _Atomic(int) foo;

Bindgen Invocation

bindgen::Builder::default()
    .header("input.h")
    .generate()
    .unwrap()

Actual Results

error: failed to run custom build command for `issue-sys v0.1.0 (/home/taaitaaiger/Projects/Rust/issue-sys)`

Caused by:
  process didn't exit successfully: `/home/taaitaaiger/Projects/Rust/issue-sys/target/debug/build/issue-sys-e97ab64c9d2c68b7/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-changed=issue.h

  --- stderr
  thread 'main' panicked at 'assertion failed: `(left == right)`
    left: `177`,
   right: `118`: Couldn't resolve constant type, and it wasn't an nondeductible auto type!', /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/ir/var.rs:318:25
  stack backtrace:
     0: rust_begin_unwind
               at /rustc/f1edd0429582dd29cccacaf50fd134b05593bd9c/library/std/src/panicking.rs:517:5
     1: core::panicking::panic_fmt
               at /rustc/f1edd0429582dd29cccacaf50fd134b05593bd9c/library/core/src/panicking.rs:100:14
     2: core::panicking::assert_failed_inner
     3: core::panicking::assert_failed
               at /rustc/f1edd0429582dd29cccacaf50fd134b05593bd9c/library/core/src/panicking.rs:138:5
     4: <bindgen::ir::var::Var as bindgen::parse::ClangSubItemParser>::parse
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/ir/var.rs:318:25
     5: <bindgen::ir::item::Item as bindgen::parse::ClangItemParser>::parse
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/ir/item.rs:1384:9
     6: bindgen::parse_one
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/lib.rs:2553:11
     7: bindgen::parse::{{closure}}::{{closure}}
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/lib.rs:2594:31
     8: bindgen::clang::visit_children
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/clang.rs:901:5
     9: <unknown>
    10: <unknown>
    11: <unknown>
    12: <unknown>
    13: clang_visitChildren
    14: clang_sys::clang_visitChildren
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/clang-sys-1.3.0/src/link.rs:165:17
    15: bindgen::clang::Cursor::visit
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/clang.rs:405:13
    16: bindgen::parse::{{closure}}
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/lib.rs:2594:9
    17: bindgen::ir::context::BindgenContext::with_module
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/ir/context.rs:2225:9
    18: bindgen::parse
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/lib.rs:2593:5
    19: bindgen::Bindings::generate
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/lib.rs:2371:13
    20: bindgen::Builder::generate
               at /home/taaitaaiger/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.59.2/src/lib.rs:1478:9
    21: build_script_build::main
               at ./build.rs:11:20
    22: core::ops::function::FnOnce::call_once
               at /rustc/f1edd0429582dd29cccacaf50fd134b05593bd9c/library/core/src/ops/function.rs:227:5
  note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

Expected Results

The existence of foo should not cause the generation of bindings to fail.

Reproduce the failure with the input.h declaration and the bindgen::Builder invocation. Start at src/ir/var.rs around line 318, then follow the parsing path through src/ir/item.rs and lib.rs; build.rs line 11 shows the caller. Done means generation no longer fails merely because foo uses _Atomic.