How deeply does Learn Rust in a Month of Lunches cover deprecation?

Explains attribute syntax, warnings, notes, replacements, and IDE highlighting without covering removal workflows.

Deprecation

As explained in Learn Rust in a Month of Lunches

The deprecated attribute marks a Rust item as discouraged for use and causes the compiler to issue a warning when it is used.

The #[deprecated] attribute marks an item, usually a function, as discouraged because it is no longer the preferred choice. Using it still compiles, but Rust emits a warning. section 13.1.5

Add note = "..." to explain why an item is deprecated, recommend a replacement, or warn that it may later be removed. IDEs may also show deprecated items with strikethrough highlighting. section 13.1.5

Pointing users to a replacement

Mark old_function as deprecated with a note directing users to new_function. Calling old_function produces the full note while the program still compiles.

How Learn Rust in a Month of Lunches covers it

Cover of Learn Rust in a Month of Lunches

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Also explained in

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Django in ActionDeprecation is the practice of announcing that an existing interface or field will be removed after a transition period.
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API Design PatternsDeprecated is the API version lifecycle state in which a former current version remains available under current-version change restrictions but is scheduled for removal.
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Automating API DeliveryThe deprecated stability level denotes an API version that is scheduled for removal.
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Effective Platform EngineeringDeprecation is the formal designation that a feature or interface remains temporarily available but should no longer be adopted and may later be removed.

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Related concepts

commentconfigured by · A comment is text or markup designated by a format's syntax as an annotation or non-content rather than ordinary executable or data content.
deleted statecontrasts with · Deleted is the API version lifecycle state in which a version has been removed and is no longer accessible.
sunset strategycontrasts with · A sunset strategy is the planned discontinuation and shutdown of a software component, such as an API or subsystem, after its supported service period.
api lifecyclepart of · An API lifecycle is the sequence of stages through which an API is designed, developed, tested, deployed, operated, evolved, and retired.
warning messageproduces · A warning message is a nonfatal diagnostic or notification about a potentially problematic, risky, unusual, or undesirable condition that may require attention.

This explainer was generated by Manning's knowledge graph from the text of Learn Rust in a Month of Lunches. The section links point to the parts of the book it draws on.