Compilation error: expected expression after 'unsafe'

[vsarunas]

Description

6.1 is able to compile the code below, but it does not compile in swift-6.2-DEVELOPMENT-SNAPSHOT-2025-04-24-a nor in swift-DEVELOPMENT-SNAPSHOT-2025-04-30-a

swiftc unsafe.swift
unsafe.swift:2:18: error: expected expression after 'unsafe'
1 | func unsafeWork(_ unsafe: Bool) -> Int {
2 |    return unsafe ? 0 : 1
  |                  `- error: expected expression after 'unsafe'
3 | }
4 | print(unsafeWork(true))

Worked around this by escaping `unsafe`.

Reproduction

func unsafeWork() -> Int {
   let unsafe: Bool = true
   return unsafe ? 0 : 1
   // this works:
   // return if unsafe { 0 } else { 1 }
}
print(unsafeWork())

Expected behavior

To compile

Environment

swiftc -v
Apple Swift version 6.2-dev (LLVM 81ab6d9f7e4810f, Swift 9cc1947)
Target: arm64-apple-macosx15.0

swiftc --version
Swift version 6.2-dev (LLVM 978186dad468cc4, Swift 2d7b7a7)
Target: x86_64-unknown-linux-gnu
Build config: +assertions

Additional information

No response