dot-is_reserved_operator function

Check if node is a contrast-manipulation operator

Some symbols are reserved for the special syntax implemented by the package. This function checks if a given node (i.e., a call) is one or more of + - * |

.is_reserved_operator(node, check_sym = NULL)

Arguments

• node: List element
• check_sym: If NULL (default), check all reserved operators. Otherwise, a string that will be converted to a symbol.

Returns

TRUE if node is identical to a reserved operator, otherwise FALSE