Function patch_seq_unpack_variant 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn patch_seq_unpack_variant(
    stack: Stack,
    field_count: i64,
) -> Stack

Unpack a variant’s fields onto the stack

Takes a field count as parameter and:

• Pops the variant from the stack
• Pushes each field (0..field_count) in order

Stack effect: ( Variant – field0 field1 … fieldN-1 )

Used by match expression codegen to extract variant fields.

Safety

Stack must have a Variant on top with at least field_count fields