Cargo Features
solana-ed25519-instruction has no features set by default.
[dependencies]
solana-ed25519-instruction = { version = "0.2.1", features = ["anchor"] }- anchor = anchor-lang
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.