Windows paths starting with `\\?\<Drive Letter>` do not work

[MolotovCherry]

If you have a path C:\foo*, it works, but if you have a path with \\?\C:\foo*, it doesn't return anything. The \\?\ is a valid path and works in other parts of the Rust std library.

Workaround for now:
Strip \\?\ from the beginning of the path

[wmmc88]

I just ran into this error as well. This happens when a windows path in canonicalized via the standard library, resulting in a path that glob fails to function on

[pavi2410]

Noticed this same issue on Windows

As a workaround, removing the prefix \\?\ works

[ChrisDenton]

Note that removing the \\?\ prefix is not always the right thing to do. E.g. \\?\UNC\ should be converted to \\. Also there are some rarer paths which don't have a win32 equivalent (e.g. a path that ends with a dot or device that isn't currently mounted to a drive or directory).

[ConnorBP]

This issue is still prevalent and is causing the --target option of rustc to fail on windows.

PS I:\DEVELOPER\PROJECTS\sus\proj\websocket_chat_rs> cargo b -Z build-std=std,core,panic_unwind --target x86_64-pc-windows-msvc.json
warning: `I:\DEVELOPER\PROJECTS\sus\proj\websocket_chat_rs\.cargo\config` is deprecated in favor of `config.toml`
note: if you need to support cargo 1.38 or earlier, you can symlink `config` to `config.toml`
warning: unused manifest key: env
warning: unused manifest key: lib.target-feature
error: failed to run `rustc` to learn about target-specific information

Caused by:
  process didn't exit successfully: `C:\Users\conno\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\bin\rustc.exe - --crate-name ___ --print=file-names -C target-feature=+crt-static --cfg=no_global_oom_handling --target \\?\I:\DEVELOPER\PROJECTS\sus\proj\websocket_chat_rs\x86_64-pc-windows-msvc.json --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit code: 1)
  --- stderr
  error: target file "\\\\?\\I:\\DEVELOPER\\PROJECTS\\sus\\proj\\websocket_chat_rs\\x86_64-pc-windows-msvc.json" does not exist

Unfortunately I have no control over the behaviour here and cannot simply "remove the prefix."

[ChrisDenton]

Sorry but can you fill in some of the steps here? What does that have to do with the glob crate? Isn't that an issue with rustc itself?