Module stability  Copy item path  Source  ConstStability  Represents the #[rustc_const_unstable] and #[rustc_const_stable] attributes. DefaultBodyStability   Represents the #[rustc_default_body_unstable] attribute. PartialConstStability   Excludes const_stable_indirect. This is necessary because when -Zforce-unstable-if-unmarked
is set, we need to encode standalone #[rustc_const_stable_indirect] attributes Stability Represents the following attributes: StabilityLevel  The available stability levels. StableSince  Rust release in which a feature is stabilized. UnstableReason  VERSION_PLACEHOLDER  The version placeholder that recently stabilized features contain inside the
since field of the #[stable] attribute.