No exceptions. Error handling uses Result and the ? propagation operator (see Chapter 10). Errors are values, not control flow. Every function that can fail says so in its return type, and the compiler enforces that you handle the error or propagate it.
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Arguments and return values use the same MogValue tagged union described earlier. Construct arguments with mog_int(), mog_string(), etc., and inspect results through the .tag and .data fields.
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