Module errors 

Stable error-code surface, mirroring xl3 (TS)’s XtlError / xtlError / isXtlError (ADR-0015) and xl3-py’s XtlError.

Status: this is the type-level parity. Internally most call sites still throw anyhow::Error with a free-form message — they migrate to XtlError::new(code, msg) as we touch each one. The down-cast helper lets a host (xl3-wasm, conformance runner) ask “is this a known XTL error?” today regardless of how many sites have moved.

Modules

code

A few canonical codes hosts will want to match on without hard- coding magic strings. The full catalogue (36 in TS, 43 in py) stays in the slash-string namespace — these are just the ones the Rust core actively emits today.

Structs

XtlError

One known XTL error code, mirroring the slash-namespaced strings the TS/py implementations emit (e.g. xl3/source/sheet-missing). Stored as a free-form string so we can stay in sync with the canonical catalogue without versioning a Rust enum every time a new code lands upstream.

Functions

is_xtl_error

Downcast helper mirroring xl3 (TS) isXtlError(e) / xl3-py is_xtl_error(e). Returns the &XtlError view when the anyhow chain originated from an XtlError, otherwise None.