smallvec 1.15.2 doc build failed

[atouchet]

https://docs.rs/crate/smallvec/latest/builds/3549516

[INFO] [stderr] warning: target filter specified, but no targets matched; this is a no-op
[INFO] [stderr]  Documenting smallvec v1.15.2 (/opt/rustwide/workdir)
[INFO] [stderr] error: couldn't read src/../debug_metadata/smallvec.natvis: No such file or directory (os error 2)
[INFO] [stderr]    --> src/lib.rs:100:25
[INFO] [stderr]     |
[INFO] [stderr] 100 |     debugger_visualizer(natvis_file = "../debug_metadata/smallvec.natvis")
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: could not document `smallvec`

[TimNN]

It's not just the doc build, it's any build enabling the debugger_visualizer feature, presumably since #397.