message: improve a client error message
diff: @@ -224,8 +224,12 @@ pub(super) mod dependencies {
  .map(|values| {
  values
  .map(|hex_hash| {
  - let digest = Digest::from_hex(hex_hash)
  - .unwrap_or_else(|error| panic!("should parse {}: {}", ARG_NAME, error));
  + let digest = Digest::from_hex(hex_hash).unwrap_or_else(|error| {
  + panic!(
  + "could not parse --{} {} as hex-encoded deploy hash: {}",
  + ARG_NAME, hex_hash, error
  + )
  + });
  DeployHash::new(digest)
  })
  .collect()
  