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14c046fc07
This PR consistently maps .ACCES into AccessDenied and .PERM into PermissionDenied. AccessDenied is returned if the file mode bit (user/group/other rwx bits) disallow access (errno was `EACCES`). PermissionDenied is returned if something else denies access (errno was `EPERM`) (immutable bit, SELinux, capabilities, etc). This somewhat subtle distinction is a POSIX thing. Most of the change is updating std.posix Error Sets to contain both errors, and then propagating the pair up through caller Error Sets. Fixes #16782