Format Code removed essential parenthesis

[matthid]

When you have code like:

type A =
    abstract member M : int -> (int -> unit)
    abstract member M : float -> int

the parenthesis around (int -> unit) are actually important, because after formatting you get

type A = 
    abstract M : int -> int -> unit
    abstract M : float -> int

Which results in a compiler error (FS0439). (In fact you first get weird compiler errors in the implementations). Can I somehow disable this as a workaround?

[dungpa]

@matthid My apologies for answering way too late (Well, it has been more than a year).

I did multiple tries to fix this bug in the past but failed. At one point, I believed that the AST lacked relevant information to preserve parentheses. I figured out a non-intrusive way to fix the bug today.

The bug has been fixed in fsprojects/fantomas#177 and the fix flows to VFPT at #1115.

[matthid]

No need to be sorry. I'm glad this will be fixed now 👍
I remember this issue was one of the blockers for me to use "Format Code on Save" with F# (which is a good way to find such bugs apparently). So maybe with 2.1.0 its time to try again :)