Possible typo in a call head

symbol.possibleTypo

Message

'<name>' is not a known function; did you mean '<suggestion>'? (An unknown symbol is treated as data in MeTTa.)

What it means

An unknown head is valid data in MeTTa: it reduces to itself, and a definition may still be added later, so it is never an error. This is a hint, not a warning. It fires only when the head is a close match (bounded Levenshtein distance) of a name you could have meant, so it most likely is a typo.

Why it happens

The name is misspelled, close to a builtin, a function you defined, or a visible imported symbol.

How to fix it

Apply the suggestion (the quick fix rewrites the head to the suggested name). If the head really is data, leave it: the hint does not change how the program evaluates.

(car-atomm (1 2))   ; symbol.possibleTypo: did you mean 'car-atom'?

Controlled by the metta.diagnostics.undefinedFunctions setting.