`let!` is allowed outside of computation expressions

[Lanayx]

open System

let run () =
    let! x = Console.WriteLine("Hello world!")
    ()

run()

Expected behavior

Error FS0750 : This construct may only be used within computation expressions

Actual behavior

The code compiles and even runs without errors (let! x is ignored)

Known workarounds

Downgrade .NET SDK to .NET 8 (haven't checked on .NET 9)

Related information

Provide any related information (optional):

.NET SDK 10.0.102
Is not reproduced on .NET SDK 8.0.403

[evgTSV]

I've checked on .NET 9, similar to .NET 8

[evgTSV]

I investigated and identified the root cause of the problem. I suspect that PR #18825 changed the behavior due to unification. This is supported by the fact that after reverting to the code before commit d82b8df, the code worked correctly. When I applied that commit, the error FS0750 vanished.