Module error_codes 

Error and status code registries defined by draft-17.

One enum per IANA registry in Section 14.5 of the draft. Variant names are the draft’s own ALLCAPS names rewritten in Rust convention; each variant’s doc comment repeats the draft spelling so the mapping stays checkable.

Codes are per-registry, not global, and the overlap is not benign: every value from 0x0 to 0x5 is assigned in all four registries, with a different meaning in nearly every cell.

code	session termination	REQUEST_ERROR	PUBLISH_DONE	data stream reset
0x0	NO_ERROR	INTERNAL_ERROR	INTERNAL_ERROR	INTERNAL_ERROR
0x1	INTERNAL_ERROR	UNAUTHORIZED	UNAUTHORIZED	CANCELLED
0x2	UNAUTHORIZED	TIMEOUT	TRACK_ENDED	DELIVERY_TIMEOUT
0x3	PROTOCOL_VIOLATION	NOT_SUPPORTED	SUBSCRIPTION_ENDED	SESSION_CLOSED
0x4	INVALID_REQUEST_ID	MALFORMED_AUTH_TOKEN	GOING_AWAY	UNKNOWN_OBJECT_STATUS
0x5	DUPLICATE_TRACK_ALIAS	EXPIRED_AUTH_TOKEN	EXPIRED	TOO_FAR_BEHIND
0x9	MALFORMED_PATH	EXCESSIVE_LOAD	EXCESSIVE_LOAD	EXCESSIVE_LOAD
0x12	DATA_STREAM_TIMEOUT	MALFORMED_TRACK	MALFORMED_TRACK	MALFORMED_TRACK
0x19	INVALID_AUTHORITY	DUPLICATE_SUBSCRIPTION	unassigned	unassigned

Carrying a value from one of these types to another is therefore always a bug, even where the two happen to share a variant name. These type names also recur in the sibling draft modules over different assignments, so an import repointed at another draft still compiles while changing meaning.

Every table’s last row reserves 0x7f * N + 0x9D for greasing (Section 13). Those code points carry no semantics, get no variants here, and are rejected by from_u64 like any other unassigned value. Note that Section 13 of this draft gives the formula as 0x7f * N + 0x9D but illustrates it with the sequence 0x9D, 0xBC, ..., whose step is 0x1f rather than 0x7f; drafts 18 and 19 keep the same formula and correct the illustration to 0x9D, 0x11C, .... The formula is treated as normative. Either reading leaves this module unchanged, since no greasing value gets a variant.

Enums

DataStreamResetErrorCode

Data Stream Reset Error Codes (draft-17, Section 14.5.4).

PublishDoneStatusCode

PUBLISH_DONE Codes (draft-17, Section 14.5.3).

RequestErrorCode

REQUEST_ERROR Codes (draft-17, Section 14.5.2).

SessionErrorCode

Session Termination Error Codes (draft-17, Section 14.5.1).