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xokdvium
reviewed
Sep 25, 2026
Previously, it would be possible to specify an args list with a different length than the specified arity. RegisterPrimOp would then raise the arity and the function would want superfluous arguments. This commit turns this into an error, and adds documentation and tests. Assisted-by: Claude Code - Claude Opus 5.5
xokdvium
reviewed
Oct 2, 2026
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| const char * const tooFew[] = {"a", nullptr}; | ||
| ASSERT_EQ(nullptr, nix_alloc_primop(ctx, primop_square, 2, "tooFew", tooFew, nullptr, nullptr)); | ||
| ASSERT_EQ(nix_err_code(ctx), NIX_ERR_NIX_ERROR); |
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I never quite understood what use the error codes have an how they are converted (or rather how they design is supposed to work...). At least my understanding was that NIX_ERROR was supposed to represent evaluation errors (and this is more akin EINVAL which we don't have).
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Not a blocker, because that part of the C API seems very undercooked in general. But I'm just wondering if I'm misunderstanding or if we really don't have any way to represent "invalid argument" errors.
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Motivation
The type for args in nix_alloc_primop was
const char **, meaning a mutable array of const strings. We actually don't mutate the array, so it's fine to make it const instead. This makes the generated rust api less awkward.Also, the first argument name was copied over instead of the correct one.
Context
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