Diagnostics

Diagnostics are part of the authoring experience, not just compiler failures. flexr check can report:

• unreachable rules and states without rules;
• empty-string matches;
• unsupported regexp constructs;
• undeclared emitted token kinds;
• variable-length trailing context;
• acceleration incompatibility;
• large transition tables and compile-time risks.

Use the code in the message to search the repository’s diagnostics catalog. Each entry explains why it happens, how to fix it, and when ignoring it is reasonable.