[SR-15305] Postfix #if expressions want necessary newline removed

[klanchman]

Previous ID	SR-15305
Radar	None
Original Reporter	@klanchman
Type	Bug

Environment

• macOS 11.6 (20G165)

• swift-format 0.50500.0, release configuration

Additional Detail from JIRA

Votes	0
Component/s	swift-format
Labels	Bug
Assignee	None
Priority	Medium

md5: 06f5c44e7c1b5b10eb313c28ce66331b

Issue Description:

When using swift-format in release configuration with default settings, using postfix #if expressions causes swift-format to remove a necessary newline.

Using the code from the evolution proposal, swift-format lint outputs a warning:

VStack {
  Text("something") <<< (swift-format) warning: [RemoveLine]: remove line break
  #if os(iOS)
  .iOSSpecificModifier()
  #endif
  .commonModifier()
}

Formatting results in code that causes a compiler error:

VStack {
  Text("something")#if os(iOS) <<< (Swift) error: Consecutive statements on a line must be separated by a newline
  .iOSSpecificModifier()
  #endif
  .commonModifier()
}