Function SYM2ID 

pub unsafe fn SYM2ID(obj: VALUE) -> ID

Convert Symbol to ID (akin to SYM2ID or RB_SYM2ID).

Converts a Symbol VALUE to its internal ID representation.

@param[in] obj A Symbol VALUE. @return The ID corresponding to the Symbol.

Safety

• obj must be a valid Symbol VALUE
• For dynamic symbols, this may access the heap