issue from vscode-swift#587

[MartinLau7]

issue from vscode-swift#587

It seems that source-kit has provided some error values

[ahoppen]

Tracked in Apple’s issue tracker as rdar://114428202

[ahoppen]

Thanks for the bug report. Just posted a PR to fix this: #804

[MartinLau7]

Will this change be included in version 5.8 or the upcoming 5.9?

[ahoppen]

The fix is too late to make it into 5.9 and will be included in Swift 5.10.