# Functions
FromGet makes a variable from a get callback.
FromPtr creates a variable from a pointer.
FromSetGet makes a variable from a set callback and a get callback.
IsBlackhole returns whether the variable is a blackhole variable.
NewAnyWithInit creates a variable with an initial value.
NewBlackhole returns a blackhole variable.
NewEnv returns an environment variable.
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# Interfaces
Var represents an Elvish variable.