[CI] Add soundness check (#824)

.github/workflows/pull_request.yml

@@ -8,3 +8,10 @@ jobs:
   tests:
     name: Test
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
+  soundness:
+    name: Soundness
+    uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
+    with:
+      format_check_enabled: false
+      license_header_check_enabled: false
+      license_header_check_project_name: "Swift.org"

Documentation/PrettyPrinter.md

@@ -490,6 +490,6 @@ sense to place this label on the containing group.
 
 Oppen's algorithm prints the indentation whitespace when `break` tokens are
 encountered. If we have extra blank lines in between source code, this can
-result in hanging or trailing whitespace. Waiting to print the indentation
+result in hanging or trailing whitespace. Waiting to print the indentation <!--# ignore-unacceptable-language -->
 whitespace until encountering a `syntax`, `comment, or `verbatim` tokens
 prevents this.

Sources/SwiftFormat/PrettyPrint/TokenStreamCreator.swift

@@ -1104,7 +1104,7 @@ fileprivate final class TokenStreamCreator: SyntaxVisitor {
   ///   - rightDelimiter: The right parenthesis or bracket surrounding the arguments, if any.
   ///   - forcesBreakBeforeRightDelimiter: True if a line break should be forced before the right
   ///     right delimiter if a line break occurred after the left delimiter, or false if the right
-  ///     delimiter is allowed to hang on the same line as the final argument.
+  ///     delimiter is allowed to hang on the same line as the final argument. # ignore-unacceptable-language
   private func arrangeFunctionCallArgumentList(
     _ arguments: LabeledExprListSyntax,
     leftDelimiter: TokenSyntax?,