sourceLocation error in Swift 6 (but not Swift 5 or with slight modification)

[leptos-null]

Description

The Swift 6 toolchain reports parameterless closing #sourceLocation() directive without prior opening #sourceLocation(file:,line:) directive unexpectedly.

Reproduction

enum SomeType {
}

#sourceLocation(file: "Orig", line: 3)
func process(_ param: SomeType) {
#sourceLocation()
}

Compile with swiftc -c -emit-module-path bug_report -swift-version 5 -parse-as-library file.swift

Expected behavior

The sample code produces a module without errors.

Note that

// swiftc -c -emit-module-path bug_report -swift-version 5 -parse-as-library file.swift

enum SomeType {
}

#sourceLocation(file: "Orig", line: 3)
func process() {
#sourceLocation()
}

completes without errors.

Environment

Tested with

Reports error:

Apple Swift version 6.0-dev (LLVM de395d39a90ed7a, Swift 490cf64aee23f13)
Target: arm64-apple-macosx14.0

Reports error:

swift-driver version: 1.109.2 Apple Swift version 6.0 (swiftlang-6.0.0.3.300 clang-1600.0.20.10)
Target: arm64-apple-macosx14.0

No error:

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