Start an interactive Futhark session. This will let you interactively enter expressions and declarations
which are then immediately interpreted. If the entered line can be either a declaration or an
expression, it is assumed to be a declaration. The input msut fit on a single line.
Futhark source files can be loaded using the :load command. This will erase any interactively entered
definitions. Use the :help command to see a list of commands. All commands are prefixed with a colon.
futharkrepl uses the Futhark interpreter, which grants access to the #[trace] and #[break] attributes.
See futhark-run for a description.