Compiler fails to produce diagnostic for 'if' statement in 'repeat'.

[YOCKOW]

Description

Given the following code, "failed to produce diagnostic for expression" error occurs when 'if' statement is used in 'repeat'.

Reproduction

func foo<each T>(_ something: repeat Optional<each T>) {
  repeat (if let something = each something { print(something) })
  // ⛔️ error: failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs)
}

func fixed<each T>(_ something: repeat Optional<each T>) {
  func __printIfNotNil<U>(_ u: U?) { if let u { print(u) } }
  repeat (__printIfNotNil(each something))
  // ✅ No problems
}

Expected behavior

Successful to compile, or emit a meaningful error message.

Environment

swift-driver version: 1.90.11.1 Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
Target: arm64-apple-macosx14.0

Additional information

No response