Unknown Feature Flag

A #![feature(...)] attribute specified a feature name that does not exist in the Rust compiler. Check the Rust nightly feature list for valid feature names.

References

doc.rust-lang.org/error_codes/E0635.html

In this namespace

← previous E0620 Cast to Unsized Type next → E0658 Unstable Feature Used

E0605 E0614 E0616 E0618 E0620 E0635 E0658