Function patch_seq_variant_init 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn patch_seq_variant_init(stack: Stack) -> Stack

Get all but the last field from a variant

Stack effect: ( Variant – Variant’ )

Returns a new variant with the same tag but without the last field. Panics if the variant has no fields. This is the “pop” operation for using variants as stacks (without returning the popped value).

Safety

Stack must have a Variant on top