Must be equal to
CRATE_NODE_ID after the crate root is expanded, but may hold
expansion placeholders or an unassigned value (
DUMMY_NODE_ID) before that.
Returns the argument unchanged.
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain
repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.
Size: 56 bytes