Module errors 

Compiler diagnostics capture via cargo check --message-format=json.

We parse the JSON stream with cargo_metadata::Message rather than scraping stderr — that gives us stable span/line/column data regardless of rustc’s human-readable formatting changes.

Structs

DiagSpan

Diagnostic

Diagnostics

Enums

DiagLevel

Functions

last_error

Run cargo check and parse the diagnostic stream.

parse_message_stream

Parse a cargo check --message-format=json stream. Public for tests and for consumers that have already captured the stream (e.g. a Cargo hook).