Based on A globally available filesystem is a security liability.
An incomplete list of globals:
- Filesystem
- Network
- Environment variables
- Current date and time
- Random seed
- Process spawner
- Native functions (FFI) caller
- Current geolocation
- …
A programming language with no globals would not be able to access the filesystem or network, and that is a good thing. The filesystem and network could be injected into the main function:
fn main(universe) {
// universe.filesystem
// universe.network
// universe.time_now
// …
}