Module builtin

Parsing and validation of builtin attributes

Structs

• Condition
• ConstStability
  Represents the #[rustc_const_unstable] and #[rustc_const_stable] attributes.
• DefaultBodyStability
  Represents the #[rustc_default_body_unstable] attribute.
• Deprecation
• Stability
  Represents the following attributes:

Enums

• DeprecatedSince
  Release in which an API is deprecated.
• InlineAttr
• InstructionSetAttr
• IntType
• OptimizeAttr
• ReprAttr
• StabilityLevel
  The available stability levels.
• StableSince
  Rust release in which a feature is stabilized.
• TransparencyError
• UnstableReason
• UnsupportedLiteralReason 🔒

Constants

• VERSION_PLACEHOLDER
  The version placeholder that recently stabilized features contain inside the since field of the #[stable] attribute.

Functions

• allow_internal_unstable
• allow_unstable 🔒
• cfg_matches
  Tests if a cfg-pattern matches the cfg set
• eval_condition
  Evaluate a cfg-like condition (with any and all), using eval to evaluate individual items.
• find_body_stability
  Collects stability info from rustc_default_body_unstable attributes in attrs. Returns None if no stability attributes are found.
• find_const_stability
  Collects stability info from rustc_const_stable/rustc_const_unstable/rustc_promotable attributes in attrs. Returns None if no stability attributes are found.
• find_crate_name
• find_deprecation
  Finds the deprecation attribute. None if none exists.
• find_repr_attrs
  Parse #[repr(…)] forms.
• find_stability
  Collects stability info from stable/unstable/rustc_allowed_through_unstable_modules attributes in attrs. Returns None if no stability attributes are found.
• find_transparency
• gate_cfg 🔒
• insert_or_error 🔒
• int_type_of_word 🔒
• is_builtin_attr
• parse_alignment
• parse_confusables
  Read the content of a rustc_confusables attribute, and return the list of candidate names.
• parse_repr_attr
• parse_stability 🔒
  Read the content of a stable/rustc_const_stable attribute, and return the feature name and its stability information.
• parse_unstability 🔒
  Read the content of a unstable/rustc_const_unstable/rustc_default_body_unstable attribute, and return the feature name and its stability information.
• parse_version
  Parse a rustc version number written inside string literal in an attribute, like appears in since = "1.0.0". Suffixes like “-dev” and “-nightly” are not accepted in this position, unlike when parsing CFG_RELEASE.
• rustc_allow_const_fn_unstable
• try_gate_cfg 🔒
• unmarked_crate_const_stab
  Calculates the const stability for a const function in a -Zforce-unstable-if-unmarked crate without the staged_api feature.