tabnas

Error reference

unprintable

Raised by the parsing engine, so any grammar can produce it.

Message 

unprintable character: {src}

Hint 

The character {src} (code point below 32) is not allowed inside a
string literal.

{placeholders} are filled from the failing token and the details the grammar attached. The wording is informative and can change between releases — the code is the contract. It is what both the TypeScript and Go runtimes guarantee.

What to do with it

  1. Read the rest of the diagnostic: row/col point at the input, expected lists the tokens that would have matched, and ruleStack shows how the parser got there.
  2. Reproduce it on its own with tabnas diagnose --json, which prints the whole object.
  3. Work the grammar back from the failing alternate — the debug-parse skill is that procedure written out, and the errors guide covers raising good ones from your own grammar.

Generated from the engine's error registry . Engine 0.8.10.