Module core::macros::builtin

Definitions of built-in macros.

Most of the macro properties (stability, visibility, etc.) are taken from the source code here, with exception of expansion functions transforming macro inputs into outputs, those functions are provided by the compiler.

Macros

• type_ascribeExperimental
  Unstable placeholder for type ascription.

Attribute Macros

• alloc_error_handlerExperimental
  Attribute macro applied to a function to register it as a handler for allocation failure.
• benchExperimental
  Attribute macro applied to a function to turn it into a benchmark test.
• cfg_accessibleExperimental
  Keeps the item it’s applied to if the passed path is accessible, and removes it otherwise.
• cfg_evalExperimental
  Expands all #[cfg] and #[cfg_attr] attributes in the code fragment it’s applied to.
• derive_constExperimental
  Attribute macro used to apply derive macros for implementing traits in a const context.
• test_caseExperimental
  An implementation detail of the #[test] and #[bench] macros.
• derive
  Attribute macro used to apply derive macros.
• global_allocator
  Attribute macro applied to a static to register it as a global allocator.
• test
  Attribute macro applied to a function to turn it into a unit test.

Derive Macros

• RustcDecodableDeprecated
  Unstable implementation detail of the rustc compiler, do not use.
• RustcEncodableDeprecated
  Unstable implementation detail of the rustc compiler, do not use.