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swift-mirror/userdocs/diagnostics/strict-language-features.md
Ben Barham 32ec5a61b7 Add groupings for the various diagnostics 
Also make the titles and one line summaries a little more consistent (at
least for diagnsotic groups and upcoming language features, haven't gone
through the educational notes).
2025-06-05 15:49:46 -07:00

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Strict language feature enablement (StrictLanguageFeatures)

Warnings for unrecognized feature names in -enable-upcoming-feature or enable-experimental-feature.

Overview

By default, if an unrecognized feature name is specified with the -enable-upcoming-feature or -enable-experimental-feature flags, the compiler will ignore it without emitting a diagnostic since some projects must be simultaneously compatible with multiple versions of the language and toolchain. This can, however, lead to misspecified features. To diagnose these cases instead, enable StrictLanguageFeatures.

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