Cargo Features

redox_syscall has no features set by default.

redox_syscall = { version = "0.5.1", features = ["rustc-dep-of-std"] }
rustc-dep-of-std = core

Enables rustc-dep-of-std of bitflags

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

core rustc-dep-of-std?

Enables rustc-std-workspace-core