2024-07-13 05:55:17 +00:00
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---
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2024-08-18 14:02:23 +00:00
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synopsis: Deprecated language features
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2024-07-13 05:55:17 +00:00
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issues: [fj#437]
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2024-08-18 14:02:23 +00:00
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cls: [1785, 1736, 1735, 1744]
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2024-07-13 05:55:17 +00:00
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category: Breaking Changes
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credits: [piegames, horrors]
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---
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2024-08-18 14:02:23 +00:00
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A system for deprecation (and then the planned removal) of undesired language features has been put into place.
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It is controlled via feature flags much like experimental features, except that the deprecations are enabled default,
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and can be disabled via the flags for backwards compatibility (opt-out with `--extra-deprecated-features` or the Nix configuration file).
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2024-07-13 05:55:17 +00:00
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2024-08-18 14:02:23 +00:00
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- `url-literals`: **URL literals** have long been obsolete and discouraged of use, and now they are officially deprecated.
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This means that all URLs must be properly put within quotes like all other strings.
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- `rec-set-overrides`: **__overrides** is an old arcane syntax which has not been in use for more than a decade.
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It is soft-deprecated with a warning only, with the plan to turn that into an error in a future release.
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2024-08-18 15:28:37 +00:00
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- `ancient-let`: **The old `let` syntax** (`let { body = …; … }`) is soft-deprecated with a warning as well. Use the regular `let … in` instead.
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