DelElement deletes an element.

ElementErrorLevel returns the level of an error returned by MakeElement or DelElement.

FromEnv returns a Var corresponding to the named environment variable.

FromGet makes a variable from a get callback.

FromInit creates a variable with an initial value.

FromPtr creates a variable from a pointer.

FromPtrWithMutex creates a variable from a pointer.

FromSetGet makes a variable from a set callback and a get callback.

HeadOfElement gets the underlying head variable of an element variable, or nil if the argument is not an element variable.

IsBlackhole returns whether the variable is a blackhole variable.

IsReadOnly returns whether v is a read-only variable.

MakeElement returns a variable, that when set, simulates the mutation of an element.

NewBlackhole returns a blackhole variable.

NewEnvListVar returns a variable whose value is a list synchronized with an environment variable with the elements joined by os.PathListSeparator.

NewReadOnly creates a variable that is read-only and always returns an error on Set.

Errors.

Errors.

UnsettableVar represents an Elvish variable that can be in an unset state.

Var represents an Elvish variable.