Wrong formatting applied to fragment of code with #if clause

[knocte]

Issue created from fantomas-online

Code

module Primitives =
    type BlockHeight =
        | BlockHeight of uint32 

    and
#if !NoDUsAsStructs
        [<Struct>]
#endif
        BlockHeightOffset16 =
            | BlockHeightOffset16 of uint16

Result

module Primitives =
    type BlockHeight = BlockHeight of uint32

#if !NoDUsAsStructs
    and [<Struct>] BlockHeightOffset16
#endif
    and BlockHeightOffset16 = BlockHeightOffset16 of uint16

Problem description

If you compile the result with NoDUsAsStructs defined, it works; but otherwise it doesn't because this code doesn't compile:

    and [<Struct>] BlockHeightOffset16
    and BlockHeightOffset16 = BlockHeightOffset16 of uint16

Extra information

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

Options

Fantomas master branch at 2022-07-11T16:44:40Z - 98a7449

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?}

[knocte]

Expected result (I guess):

module Primitives =
    type BlockHeight = BlockHeight of uint32 

    and
#if !NoDUsAsStructs
        [<Struct>]
#endif
        BlockHeightOffset16 = BlockHeightOffset16 of uint16

[nojaf]

Same problem as #2360

[nojaf]

Fix available in v5.2.0-beta-001