Swift Dev Trunk Compile Fails: Package.resolved file is most likely severely out-of-date

[xanderdunn]

macOS 10.15.6. Swift dev trunk October 15th 2020:

$ which swift
/home/xander/swift-DEVELOPMENT-SNAPSHOT-2020-10-15-a-ubuntu18.04/usr/bin/swift
$ swift --version
Swift version 5.3-dev (LLVM 2ea629d94ab01c3, Swift aa3e5904f8ba8bf)
Target: x86_64-unknown-linux-gnu
$ swift build
Fetching https://github.com/scottrhoyt/SwiftyTextTable.git
Fetching https://github.com/RuntimeTools/SwiftMetrics.git
Cloning https://github.com/RuntimeTools/SwiftMetrics.git
Resolving https://github.com/RuntimeTools/SwiftMetrics.git at 2.6.4
Cloning https://github.com/scottrhoyt/SwiftyTextTable.git
Resolving https://github.com/scottrhoyt/SwiftyTextTable.git at 0.9.0
Updating https://github.com/RuntimeTools/SwiftMetrics.git
Updating https://github.com/scottrhoyt/SwiftyTextTable.git
Fetching https://github.com/IBM-Swift/BlueCryptor.git
Fetching https://github.com/RuntimeTools/omr-agentcore
Fetching https://github.com/IBM-Swift/Swift-cfenv.git
Fetching https://github.com/IBM-Swift/Kitura-WebSocket.git
Fetching https://github.com/IBM-Swift/Kitura.git
Cloning https://github.com/IBM-Swift/Kitura-WebSocket.git
Resolving https://github.com/IBM-Swift/Kitura-WebSocket.git at 2.1.200
Cloning https://github.com/RuntimeTools/omr-agentcore
Resolving https://github.com/RuntimeTools/omr-agentcore at 3.2.4-swift4
Cloning https://github.com/IBM-Swift/BlueCryptor.git
Resolving https://github.com/IBM-Swift/BlueCryptor.git at 1.0.200
Cloning https://github.com/IBM-Swift/Kitura.git
Resolving https://github.com/IBM-Swift/Kitura.git at 2.9.200
Cloning https://github.com/IBM-Swift/Swift-cfenv.git
Resolving https://github.com/IBM-Swift/Swift-cfenv.git at 6.0.200
error: the Package.resolved file is most likely severely out-of-date and is preventing correct resolution; delete the resolved file and try again

This is not in reference to SwiftMetrics' Package.resolved, as deleting it does nothing. I believe it is in reference to the Swift-cfenv's Package.resolved at version 6.0.200.