Uh oh!
There was an error while loading. Please reload this page.
Remove always-on OpenTypeDeclaration language feature flag - #20209
Merged
Conversation
Contributor
|
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
T-Gro
enabled auto-merge (squash)
August 6, 2026 11:35
abonie
approved these changes
Aug 6, 2026
Uh oh!
There was an error while loading. Please reload this page.
bartelink pushed a commit
to bartelink/fsharp
that referenced
this pull request
Aug 6, 2026
| LanguageFeature.AndBang, languageVersion50 | ||
| LanguageFeature.NullableOptionalInterop, languageVersion50 | ||
| LanguageFeature.DefaultInterfaceMemberConsumption, languageVersion50 | ||
| LanguageFeature.OpenTypeDeclaration, languageVersion50 |
Member
There was a problem hiding this comment.
Should we keep a document with these features somewhere? Maybe we could keep them here as a reference?
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for freeto join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Fixes#20148
LanguageFeature.OpenTypeDeclarationhas been on for every selectable--langversionsince F# 5.0 and can never be turned off, so the flag was dead configuration. This removes the flag and collapses the guarded code to its enabled behaviour. As a consequence,--disableLanguageFeature:OpenTypeDeclarationis no longer a recognised feature name.