Mutable global variable.
Often in OCaml you want to have a global variable, which is mutable
and uninitialized when declared. You can use a
'a option ref but
this is not very convenient. The Global module provides functions
to easily create and manipulate such variables.
Abstract type of a global
Raised when a global variable is accessed without first having been assigned a value. The parameter contains the name of the global.
Returns an new named empty global. The name of the global can be any string. It identifies the global and makes debugging easier.