Ensure no global variables are polluted during an expression.

If any global variables are removed or created, it will give a descriptive error.

ensure_no_global_variable_pollution(expr, desc, check_options = FALSE)

Arguments

expr	expression. The R expression to evaluate
desc	character. A string to add to "you modified global
check_options	logical. Whether to check if any global options were changed. variables while [desc goes here]".

Value

the output of the expr.