Upon downloading the newest snapshot and trying to play it, the game will fail to load. I get this error in the development console in the launcher:

Client> Exception in thread "main" joptsimple.MissingRequiredOptionException: Missing required option(s) ['version']
Client> at joptsimple.OptionParser.ensureRequiredOptions(OptionParser.java:399)
Client> at joptsimple.OptionParser.parse(OptionParser.java:389)
Client> at net.minecraft.client.main.Main.main(SourceFile:36)
Game ended with bad state (exit code 1)
Deleting C:\Users\user\AppData\Roaming\.minecraft\bin\versions\13w23a\13w23a-natives-334408035199924
Couldn't delete C:\Users\user\AppData\Roaming\.minecraft\bin\versions\13w23a\13w23a-natives-334408035199924 - scheduling for deletion upon exit