Require the token following yield to be on the same line.

Author: allevato

Sources/SwiftFormatPrettyPrint/TokenStreamCreator.swift

@@ -764,7 +764,9 @@ fileprivate final class TokenStreamCreator: SyntaxVisitor {
   }
 
   override func visit(_ node: YieldStmtSyntax) -> SyntaxVisitorContinueKind {
-    after(node.yieldKeyword, tokens: .break)
+    // As of https://github.com/apple/swift-syntax/pull/895, the token following a `yield` keyword
+    // *must* be on the same line, so we cannot break here.
+    after(node.yieldKeyword, tokens: .space)
     return .visitChildren
   }
 

Tests/SwiftFormatPrettyPrintTests/YieldStmtTests.swift

@@ -17,14 +17,12 @@ final class YieldStmtTests: PrettyPrintTestCase {
       """
       var foo: Int {
         _read {
-          yield
-            1234567890
+          yield 1234567890
         }
         _modify {
           var someLongVariable =
             0
-          yield
-            &someLongVariable
+          yield &someLongVariable
         }
       }