Crate rustc_attr

Functions and types dealing with attributes and meta items.

FIXME(Centril): For now being, much of the logic is still in rustc_ast::attr. The goal is to move the definition of MetaItem and things that don’t need to be in syntax to this crate.

Re-exports

• pub use IntType::*;
• pub use ReprAttr::*;
• pub use StabilityLevel::*;

Modules

• builtin 🔒
  Parsing and validation of builtin attributes
• session_diagnostics 🔒

Structs

• AttrIdGenerator
• Condition
• ConstStability
  Represents the #[rustc_const_unstable] and #[rustc_const_stable] attributes.
• DefaultBodyStability
  Represents the #[rustc_default_body_unstable] attribute.
• Deprecation
• MarkedAttrs
• 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

Constants

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

Statics

• DEFAULT_LOCALE_RESOURCE
  Raw content of Fluent resource for this crate, generated by fluent_messages macro, imported by rustc_driver to include all crates’ resources in one bundle.

Functions

• allow_internal_unstable
• cfg_matches
  Tests if a cfg-pattern matches the cfg set
• contains_name
• eval_condition
  Evaluate a cfg-like condition (with any and all), using eval to evaluate individual items.
• filter_by_name
• find_body_stability
  Collects stability info from rustc_default_body_unstable attributes in attrs. Returns None if no stability attributes are found.
• find_by_name
• 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
• first_attr_value_str_by_name
• is_builtin_attr
• list_contains_name
• mk_attr
• mk_attr_from_item
• mk_attr_name_value_str
• mk_attr_nested_word
• mk_attr_word
• mk_doc_comment
• parse_alignment
• parse_confusables
  Read the content of a rustc_confusables attribute, and return the list of candidate names.
• parse_repr_attr
• 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
• unmarked_crate_const_stab
  Calculates the const stability for a const function in a -Zforce-unstable-if-unmarked crate without the staged_api feature.