F# Range Operator (..) with negative numbers produces invalid F# code and idempotent

[berkhoutalex]

Issue created from fantomas-online

Code

[|-24.0 .. -1.0 .. -30.0|]

Result

[| -24.0 ..- 1.0 ..- 30.0 |]

Problem description

When making an F# range with a negative increment, the formatter produces invalid code after the first run. Then after running again, it produces different invalid code

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.
• I would like a release if this problem is solved.

Options

Fantomas main branch at 1/1/1990

Default Fantomas configuration

_{Did you know that you can ignore files when formatting by using a .fantomasignore file?
PS: It's unlikely that someone else will solve your specific issue, as it's something that you have a personal stake in.}

[berkhoutalex]

As a workaround, you can rewrite it as
[|-24. .. -1. .. -30.|]
and it seems to work correctly

[nojaf]

Hello,

Thank you for reporting this issue. I believe I have found a fix for this.