Fix crash when last superclass entry has a delegate

Summary: If the last entry is delegated, there must be a newline or Kotlin doesn't accept it (maybe due to infix methods in the initializer? who knows)

Reviewed By: cgrushko

Differential Revision: D34347730

fbshipit-source-id: 6d6bc460e3474e77c431a262064767638d133c89

core/src/main/java/com/facebook/ktfmt/format/KotlinInputAstVisitor.kt

@@ -1409,6 +1409,9 @@ class KotlinInputAstVisitor(
  builder.space()
  val typeConstraintList = classOrObject.typeConstraintList
  if (typeConstraintList != null) {
+ if (superTypes?.entries?.lastOrNull() is KtDelegatedSuperTypeEntry) {
+ builder.forcedBreak()
+ }
  visit(typeConstraintList)
  builder.space()
  }

core/src/test/java/com/facebook/ktfmt/format/FormatterTest.kt

@@ -2682,6 +2682,14 @@ class FormatterTest {
  | }
  |""".trimMargin())
 
+ @Test
+ fun `handle compound generic bounds on class with delegate`() =
+ assertFormatted(
+ """
+ |class Foo<T>() : Bar by bar
+ |where T : Qux
+ |""".trimMargin())
+
  @Test
  fun `explicit type on property getter`() =
  assertFormatted(