Completion returns empty result in result builder else if block

[hamishknight]

The following returns no completion results:

import SwiftUI

struct R {
  var bar: Bool
}

func baz<R>(@ViewBuilder _ fn: () -> R) -> R { fn() }

func foo(_ x: R, _ b: Bool) -> some View {
  baz {
    if b {
      EmptyView()
    } else if !b {
      if x.#^CC^# {}
    }
  }
}

Swift version 6.2-dev (LLVM 496a44abf299a10, Swift c35d65e)
Target: arm64-apple-macosx15.0

[hamishknight]

Without SwiftUI:

protocol View {}

struct EmptyView: View {}
struct Either<T: View, U: View>: View {}
struct Tuple<T>: View {}
extension Optional: View where Wrapped: View {}

@resultBuilder
struct ViewBuilder {
  static func buildBlock() -> EmptyView { .init() }
  static func buildBlock<T: View>(_ x: T) -> T { x }
  @_disfavoredOverload static func buildBlock<each T: View>(
    _ x: repeat each T
  ) -> Tuple<(repeat each T)> { .init() }
  static func buildEither<T, U>(first component: T) -> Either<T, U> { .init() }
  static func buildEither<T, U>(second component: U) -> Either<T, U> { .init() }
  static func buildIf<T: View>(_ x: T?) -> T? { x }
}

struct R {
  var bar: Bool
}

func baz<R>(@ViewBuilder _ fn: () -> R) {}

func foo(_ x: R, _ b: Bool) {
  baz {
    if b {
      EmptyView()
    } else if b {
      if x.#^CC^# {}
    }
  }
}