Module error 

One error type, two granularities.

Why two

The daemon reports distinct statuses such as Conflict, NotFound, and ProtocolError. The CLI groups them into a coarse process exit category while retaining the finer wire kind in its JSON envelope.

Error::kind answers the exit-category question; Error::wire_kind answers which daemon condition occurred. The conformance suite checks both contracts.

What a caller matches on

ErrorKind, nearly always. WireKind exists for the two consumers that need the finer view: the conformance driver, and a caller retrying a specific daemon condition. Nobody should parse a message.

Structs

Error

A failure, classified once at the point it is raised.

Enums

ErrorKind

The coarse failure classes, one per non-zero row of the CLI’s exit table.

WireKind

The fine-grained taxonomy: one variant per condition the daemon or the transport distinguishes.