Match statements should not be split into separate lines between parentheses

[ghost]

Issue created from fantomas-online

Code

type Foo =
  | Bar of int
  | Baz

let foo =
  function
  | Foo (1 | 2) -> true
  | _ -> false

Result

type Foo =
    | Bar of int
    | Baz

let foo =
    function
    | Foo (1
    | 2) -> true
    | _ -> false

Problem description

When I format match expressions using multiple sub-cases in parentheses, Fantomas formats each sub-case as though it were a main case, whereas it should not split short parenthesized expressions across lines.

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 branch at 1/1/1990

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?}

[nojaf]

Hello, thank you for reporting this issue.

The main problem here is that Fantomas has one way of formatting patterns regardless of where in the syntax tree they occur.
I believe some separation of printing patterns in CodePrinter.fs might be interesting to introduce to tackle these kinds of problems.

Are you interested in submitting a PR for this?

[ghost]

Are you interested in submitting a PR for this?

Unfortunately, I am not.

[nojaf]

This was fixed by #2407.
A regression test could solve this issue.