Get object from the qenv
environment.
Usage
get_var(object, var)
# S4 method for qenv,character
get_var(object, var)
# S4 method for qenv.error,ANY
get_var(object, var)
# S4 method for qenv,ANY,missing
[[(x, i, j, ...)
# S3 method for qenv.error
[[(x, i, j, ...)