// dylib support for shared_mutex was added in macosx10.12
// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
-// TODO(ldionne): This test fails on Ubuntu Focal on our CI nodes (and only there), in 32 bit mode.
-// UNSUPPORTED: linux && 32bits-on-64bits
-
// <shared_mutex>
// template <class Mutex> class shared_lock;