Lines      Copies    Function name
  -----      ------    -------------
  12 (100%)  4 (100%)  (TOTAL)
   3 (25.0%) 1 (25.0%) <hkdf::errors::InvalidLength as core::fmt::Debug>::fmt
   3 (25.0%) 1 (25.0%) <hkdf::errors::InvalidLength as core::fmt::Display>::fmt
   3 (25.0%) 1 (25.0%) <hkdf::errors::InvalidPrkLength as core::fmt::Debug>::fmt
   3 (25.0%) 1 (25.0%) <hkdf::errors::InvalidPrkLength as core::fmt::Display>::fmt