Function NIL_P 

pub fn NIL_P(obj: VALUE) -> bool

Checks if the given object is nil.

• @param[in] obj An arbitrary ruby object.
• @retval true obj is ::RUBY_Qnil.
• @retval false Anything else.

Example

use rb_sys::special_consts::*;

assert!(NIL_P(Qnil));
assert!(!NIL_P(Qtrue));