FL0034: False positive with F# 5

Description

When installing F# 5, I have faced an error due to an overload resolution change and after fixing it, I keep getting the FL0034. See https://github.com/dotnet/fsharp/issues/10424

Repro steps

Before F# 5:

let frameDuration =
	getFrameRate model
	|> Option.defaultValue(10</s>)
	|> fun rate -> 1 / rate * 1000<ms/s>
	|> int
Cmd.batch [
	Cmd.ofMsg NextFrame
	Cmd.OfAsync.perform Async.Sleep frameDuration (fun () -> AutoPlayNextFrame)
]

With F# 5 (a new TimeSpan overload as been introduced)

let frameDuration =
	getFrameRate model
	|> Option.defaultValue(10</s>)
	|> fun rate -> 1 / rate * 1000<ms/s>
	|> int
Cmd.batch [
	Cmd.ofMsg NextFrame
	Cmd.OfAsync.perform (fun (x:int) -> Async.Sleep x) frameDuration (fun () -> AutoPlayNextFrame)
]

Expected behavior

No warning on the (fun (x:int) -> Async.Sleep x)

Actual behavior

Warning

Known workarounds

None, to my knowledge.

Related information

• Operating system: Win10
• net48, F# 5
• VS2019 latest and VS2019 Preview

Start with the FL0034 rule and reproduce the supplied F# 5 example, including the Async.Sleep overload and the linked F# issue. Trace why the typed lambda is reported, then add or update coverage for this reproduction so the warning is absent when the behavior is fixed.