Skip to content

[WIP] Add --disableLanguageFeature CLI switch and MSBuild property to selectively disable language features #19167

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Draft
Copilot wants to merge 19 commits into
base: main
Choose a base branch
from
+317 −22

Refactor to use immutable LanguageVersion with reflection-based featu…

cc29923
Select commit
Loading
Failed to load commit list.
Draft

[WIP] Add --disableLanguageFeature CLI switch and MSBuild property to selectively disable language features #19167

Refactor to use immutable LanguageVersion with reflection-based featu…
cc29923
Select commit
Loading
Failed to load commit list.
Azure Pipelines / fsharp-ci (Build WindowsNoRealsig_testCoreclr) failed Dec 16, 2025 in 11m 25s

Build WindowsNoRealsig_testCoreclr failed

2 errors / 1 warnings

Annotations

Check failure on line 443 in src\Compiler\Facilities\LanguageFeatures.fs

See this annotation in the file changed.

@azure-pipelines azure-pipelines / fsharp-ci (Build WindowsNoRealsig_testCoreclr)

src\Compiler\Facilities\LanguageFeatures.fs#L443 

src\Compiler\Facilities\LanguageFeatures.fs(443,36): error FS3264: (NETCORE_ENGINEERING_TELEMETRY=Build) Nullness warning: Downcasting from 'objnull' into 'LanguageFeature' can introduce unexpected null values. Cast to 'LanguageFeature|null' instead or handle the null before downcasting.

Check failure on line 443 in src\Compiler\Facilities\LanguageFeatures.fs

See this annotation in the file changed.

@azure-pipelines azure-pipelines / fsharp-ci (Build WindowsNoRealsig_testCoreclr)

src\Compiler\Facilities\LanguageFeatures.fs#L443 

src\Compiler\Facilities\LanguageFeatures.fs(443,36): error FS3264: (NETCORE_ENGINEERING_TELEMETRY=Build) Nullness warning: Downcasting from 'objnull' into 'LanguageFeature' can introduce unexpected null values. Cast to 'LanguageFeature|null' instead or handle the null before downcasting.
View more details on Azure Pipelines