HenryHRich
commented
2 months ago Agreed that domain error is misleading. 'value error'means undefined name. This is a /pun in type/, where JE analyzed a phrase using the parts of speech of the defined names, and later, when the result of the analysis was to be used, a name had a different type. Worth a better message, I agree.
Henry Rich
On Sat, Aug 17, 2024, 11:52 PM Cameron Chandoke @.***> wrote:
f=: N+] N=: 3 f 1 |domain error in N, executing monad N | f 1
Because N wasn't defined at the time that f was, it was assumed to be a verb. When the execution of [N as a verb], an error was raised because it instead referred to a noun.
This is reported as a domain error, which it is confusing; it should be interpreted as a value error since it concerns N's part-of-speech only. It might say e.g.
|value error in N, executing monad N: N was expected to be a verb, but is defined as a noun | f 1
Perhaps better would be to instead attempt to interpret N as a noun and apply the containing expression accordingly, upon the interpreter seeing that N is a noun (or just as a general fallback to attempted verb interpretations). This latter suggestion might not be feasible, depending on implementation details.
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Because
Nwasn't defined at the time thatfwas, it was assumed to be a verb. When the execution of [Nas a verb] was attempted, an error was raised because it instead referred to a noun.This is reported as a domain error, which it is confusing; it should be interpreted as a value error since it concerns N's part-of-speech only. It might say e.g.
Perhaps better would be to instead attempt to interpret
Nas a noun and apply the containing expression accordingly, upon the interpreter seeing that N is a noun (or just as a general fallback to attempted verb interpretations). This latter suggestion might not be feasible, depending on implementation details.