Remove always-on language feature flag: AdditionalTypeDirectedConversions
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描述
LanguageFeature.AdditionalTypeDirectedConversions has shipped since F# 6.0 and is enabled for every selectable language version (the minimum accepted --langversion is 8.0). Its feature flag can therefore never be turned off, so it is dead configuration. This issue removes the flag and collapses the guarded code to its enabled behaviour.
What to remove
- The
AdditionalTypeDirectedConversionscase inLanguageFeatures.fsandLanguageFeatures.fsi - Its entry in the
featuresmap and itsGetFeatureStringarm - The
featureAdditionalImplicitConversionsstring inFSComp.txt - Every
SupportsFeature LanguageFeature.AdditionalTypeDirectedConversions/checkLanguageFeatureAndRecover … AdditionalTypeDirectedConversionsguard — keep only the enabled path and delete the legacy branch - Adjust affected tests and baselines accordingly
Consequence: --disableLanguageFeature:AdditionalTypeDirectedConversions is no longer a recognised feature name.
Version mapping
https://github.com/dotnet/fsharp/blob/ea778bb414648883fca4219bf7a69286bf82dd6b/src/Compiler/Facilities/LanguageFeatures.fs#L174
Feature string
https://github.com/dotnet/fsharp/blob/ea778bb414648883fca4219bf7a69286bf82dd6b/src/Compiler/FSComp.txt#L1584
Part of #20139
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