Pattern matching breaks code when expression is long and somewhat complex

[reinux]

Issue created from fantomas-online

Code

match x (Map.tryFind somelongidentifier a + Option.defaultValue longidentifier) with
| _ -> ()

Error

Fantomas was able to format the code but the result appears to be invalid F# code.
Please open an issue.

Formatted result:

match x (
    Map.tryFind somelongidentifier a
    + Option.defaultValue longidentifier
) with
| _ -> ()

Problem description

Please describe here the Fantomas problem you encountered.
Check out our Contribution Guidelines.

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 01/05/2021 21:00:18 - d5f4d9f

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?}