Minecraft wiki entry for execute, associated text: Result
Unparseable if the argument is not specified correctly
In following conditions, terminates when this subcommand is not at the end of the subcommands chain; fails when at the end:
If <pos> is unloaded or out of the world.
If test doesn't pass.
When at the end of the subcommands chain, and the command is successful, success value and result value is 1.