Lazy causes indentation to produce invalid F#

[Smaug123]

Issue created from fantomas-online

Code

module Foo =
    let foo =
        lazy (
            if not <| bar then
                raise <| Exception "Very very very very very very very very very very very very very very long"
            let ret = false
            if ret then
                "foo"
            else
                "bar"
            |> log.Info
            ret
        )

Result

module Foo =
    let foo =
        lazy
            (if not <| bar then
                 raise
                 <| Exception "Very very very very very very very very very very very very very very long"

            let ret = false

            if ret then "foo" else "bar"
            |> log.Info

            ret)

Problem description

The let ret = false line can't go where it currently is, for indentation reasons. I think the solution in the original code snippet, of putting the bracket on the preceding line and then indenting everything one place, looks best - but possibly worth discussing with other people.

Extra information

• [/] The formatted result breaks by code.
• The formatted result gives compiler warnings.
• I or my company would be willing to help fix this.

Options

Fantomas Master at 07/01/2021 18:56:12 - 3a12872

Default Fantomas configuration

_{Did you know that you can ignore files when formatting from fantomas-tool or the FAKE targets by using a .fantomasignore file?}

[Smaug123]

We have an easy workaround for this internally: in scope, we've already essentially got Lazy.fromFunc : (unit -> 'a) -> Lazy<'a> which we can use instead.

[nojaf]

I'm going to solve the problem of the invalid result in this issue, but I also raised dotnet/docs#24977. So perhaps later, I can circle back if this is also a stylistic bug.