Package.swift diagnostics on wrong line

[award999]

Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?

• Confirmed reproduction steps with SwiftPM CLI.

Description

SwiftPM diagnostics for the Package.swift show up at a different line/column than SourceKit-LSP. In this picture the first diagnostics is from SourceKit and shows up at right place, but SwiftPM indicates the diagnostic is on the next line

Expected behavior

No response

Actual behavior

No response

Steps to reproduce

1. Set macOS platform to v13 in Package.swift
2. Set swift tool version to 5.6: // swift-tools-version: 5.6
3. Save file and swift package resolve

Notice output:

As you can see in the picture above the line was line 9, so line is off by one, but the column seems right

Swift Package Manager version/commit hash

No response

Swift & OS version (output of swift --version ; uname -a)

swift-driver version: 1.110 Apple Swift version 6.0 (swiftlang-6.0.0.4.52 clang-1600.0.21.1.3)
Target: arm64-apple-macosx15.0

[MaxDesiatov]

Is this reproducible for errors in other files too, or only Package.swift?

[award999]

Only seems to be this specific case in Package.swift, for example doing something like this put on the right line (22 like I'd expect):

All diagnostics from swiftc seem correct