Selected methods disappear after formatting

[vasily-kirichenko]

module M

type T () = 
    let items = []
    member x.Reorder () = 
        items |> List.iter ignore

If I format the following selection: The method entirely disappears:

[dungpa]

I think I understand the reason.

Fantomas can't parse the method alone and produce an empty parse tree, leading to empty results.

Tentative solution (which I will try to implement next week):

• Match the first token of the selection against member, abstract, default, override, interface, etc keywords.
• Prepend the selection with dummy type declaration type T () = \n.
• Format the new string.
• Remove the formatted header.
• Align the selection based on the original column.

I think there are other scenarios which require certain heuristics to be processed correctly. Your bug reports help a lot in this regard.

[dungpa]

@vasily-kirichenko Thanks for reporting this. I published Fantomas v0.9.6 which should fix the bug and the other one in #5. Can you please check?

[vasily-kirichenko]

Fixed in Fantomas 0.9.6