Function extern_spec_BitAndAssign__ref_u64_u64_bitand_assign 

pub fn extern_spec_BitAndAssign__ref_u64_u64_bitand_assign(
    self_: &mut u64,
    rhs: &u64,
)

extern spec for u64::bitand_assign

This is not a real function: its only use is for documentation.

ghost

ensures

^self == *self $op *rhs