F# RFC FS-1115 - Tracking the use of InlineIfLambda in FSharp.Core

F# 6 added the InlineIfLambda feature.

This is a long-running pre-approved RFC tracking the use of this feature in FSharp.Core.

NOTE: It appears to make sense to just go through FSharp.Core systematically and use it on every inlined function that takes a lambda which is only applied once

NOTE: It is likely inline could be used more widely across FSharp.Core as well

Approved uses in FSharp.Core 6.0.0

• Array.map
• Array.iter
• Array.minBy
• Array.compareWith
• Resumable code and tasks

NOTE: this list appears adhoc and we should be systematic, hence this RFC

Approved uses in current preview

• lock
• Array.init
• Array.sumBy
• Array.averageBy
• List.iter
• List.iteri
• List.sumBy
• List.averageBy
• List.compareWith
• Seq.sumBy
• Seq.averageBy

Drawbacks

• There are no known drawbacks of using this with the above functions.

Alternatives

• Don't use it

Unresolved questions

• Other uses

• See dotnet/fsharp#6424