Swift REPL dyld: Library not loaded: @rpath/libArgumentParserToolInfo.dylib

Using Swift
1

I'm running on a 2013 Mac so I can only use up to MacOS Big Sur, therefore I cannot download the latest Xcode, yet I wish to use the latest Swift release (5.6.2 at time of writing) from the terminal.

I went and downloaded the release from Swift.org - Download Swift . After installing, compiling code works with swift build, but the repl does not. E.g.:

% swift -v                             
Apple Swift version 5.6.2 (swift-5.6.2-RELEASE)
Target: x86_64-apple-macosx11.0
/Library/Developer/Toolchains/swift-5.6.2-RELEASE.xctoolchain/usr/bin/swift-frontend --version
Apple Swift version 5.6.2 (swift-5.6.2-RELEASE)
Target: x86_64-apple-macosx11.0
/Library/Developer/Toolchains/swift-5.6.2-RELEASE.xctoolchain/usr/bin/swift-help intro
error: help command failed due to signal 6 (use -v to see invocation)
dyld: Library not loaded: @rpath/libArgumentParserToolInfo.dylib
  Referenced from: /Library/Developer/Toolchains/swift-5.6.2-RELEASE.xctoolchain/usr/lib/swift/macosx/libArgumentParser.dylib
  Reason: image not found

I further attempted the following, as written in the "Installation" section of the provided link above:

% xcrun --toolchain swift-5.6.2-RELEASE
xcrun: error: no utility name specified
% xcodebuild -toolchain swift-5.6.2-RELEASE
Command line invocation:
    /Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -toolchain swift-5.6.2-RELEASE

User defaults from command line:
    IDEPackageSupportUseBuiltinSCM = YES

Build settings from command line:
    TOOLCHAINS = swift-5.6.2-RELEASE

xcodebuild: error: The directory /Users/Me/Documents/projects does not contain an Xcode project.

which did not seem to help at all.

It appears that libArgumentParserToolInfo.dylib which I assume is built from GitHub - apple/swift-argument-parser: Straightforward, type-safe argument parsing for Swift does exist:

% ls /Library/Developer/Toolchains/swift-5.6.2-RELEASE.xctoolchain/usr/lib/swift/macosx/libArgumentParser.dylib
/Library/Developer/Toolchains/swift-5.6.2-RELEASE.xctoolchain/usr/lib/swift/macosx/libArgumentParser.dylib*

I am not positive I understand what Reason: image not found means then.

Any help in resolving this would be much appreciated

2

I finally caved and bought a new mac. Though I'd still like to find a solution to this because it seems unfair to require Xcode to use the repl. There are other features that are unavailable as well, though basic swift build and swift test work at least.