0.6.0

• Added "unstable" crate feature to separate unstable features from stable features. When using features that depend on unstable APIs, the "unstable" feature must be explicitly enabled.

• Improved compile time.

• Renamed #[rec] to #[nested].

• Removed marker(name) option in favor of marker = name.

• Removed never option in argument position in favor of #[enum_derive] attribute.

• Removed "proc_macro" crate feature.

• Added "ops" crate feature, and made [std|core]::ops's Deref, DerefMut, Index, IndexMut, and RangeBounds traits optional.

• Added "convert" crate feature, and made [std|core]::convert's AsRef and AsMut traits optional.

• Added "generator_trait" crate feature, and made [std|core]::ops::Generator traits optional. (nightly-only)

• Added "fn_traits" crate feature, and made Fn, FnMut, and FnOnce traits optional. (nightly-only)

• Added "trusted_len" crate feature, and made [std|core]::iter::TrustedLen traits optional. (nightly-only)

• Improved error messages.

(There are no changes since the 0.6.0-alpha.3 release.)