[SR-13049] prioritizeKeepingFunctionOutputTogether → Assertion failed: Too many unresolved delimiter token lengths.

[swift-ci]

Previous ID	SR-13049
Radar	None
Original Reporter	SDGGiesbrecht (JIRA User)
Type	Bug

Environment

macOS 10.15
Swift 5.2.4
swift-format 0.50200.1 (--configuration debug)

Additional Detail from JIRA

Votes	1
Component/s	swift-format
Labels	Bug
Assignee	None
Priority	Medium

md5: 03dbcc7fa590f6df220907a3ac3b2572

Issue Description:

Formatting with `prioritizeKeepingFunctionOutputTogether` engaged can lead to assertion failures.

This code is enough to trip it:

init(a: B) {}

[typesanitizer]

cc @allevato

[pdesjardins90]

I get this error too even when setting:

prioritizeKeepingFunctionOutputTogether: false

using swift 5.5.2 + swift-format 0.50500.0 on ubuntu

EDIT:

Found a different culprit:
rules: { BeginDocumentationCommentWithOneLineSummary: true }

[MrJackScratch]

Just got this error as well, prioritizeKeepingFunctionOutputTogether was the culprit.

[ahoppen]

Tracked in Apple’s issue tracker as rdar://126948255