Hangs indefinitely on Linux

[Cyberbeni]

I have tried:

• swift:6.0.1 docker and run swift format ./test.swift
• Inside ubuntu-latest GitHub workflow: checkout 600.0.0, swift build --configuration release --disable-sandbox and run ./.build/release/swift-format ./test.swift or ./.build/release/swift-format lint ./test.swift

Both of these just result in no output and keep running indefinitely.

[ahoppen]

Synced to Apple’s issue tracker as rdar://138397913

[ahoppen]

Sounds like this is #847.