Merge pull request swiftlang#5 from allevato/sr-11113

Ensure a space after `@unknown` in a default case.

Author: allevato

Sources/SwiftFormatPrettyPrint/TokenStreamCreator.swift

@@ -509,6 +509,7 @@ private final class TokenStreamCreator: SyntaxVisitor {
 
   func visit(_ node: SwitchCaseSyntax) -> SyntaxVisitorContinueKind {
     before(node.firstToken, tokens: .newline)
+    after(node.unknownAttr?.lastToken, tokens: .space)
     after(node.label.lastToken, tokens: .break(.reset, size: 0), .break(.open), .open)
     after(node.lastToken, tokens: .break(.close, size: 0), .close)
     return .visitChildren

Tests/SwiftFormatPrettyPrintTests/SwitchStmtTests.swift

@@ -196,4 +196,24 @@ public class SwitchStmtTests: PrettyPrintTestCase {
 
     assertPrettyPrintEqual(input: input, expected: expected, linelength: 45)
   }
+
+  public func testUnknownDefault() {
+    let input =
+      """
+      switch foo {
+      @unknown default: bar()
+      }
+      """
+
+    let expected =
+      """
+      switch foo {
+      @unknown default:
+        bar()
+      }
+
+      """
+
+    assertPrettyPrintEqual(input: input, expected: expected, linelength: 20)
+  }
 }

Tests/SwiftFormatPrettyPrintTests/XCTestManifests.swift

@@ -405,6 +405,7 @@ extension SwitchStmtTests {
         ("testSwitchCases", testSwitchCases),
         ("testSwitchCompoundCases", testSwitchCompoundCases),
         ("testSwitchValueBinding", testSwitchValueBinding),
+        ("testUnknownDefault", testUnknownDefault),
     ]
 }