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fix: correct misleading unhashable-spec error message #7

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Merged
oek1ng merged 1 commit into from
Jun 3, 2026
Merged

fix: correct misleading unhashable-spec error message #7

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7 changes: 4 additions & 3 deletions src/zspec/serialize.py
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Original file line number Diff line number Diff line change
Expand Up @@ -72,9 +72,10 @@ def _to_dict_leaf(spec: Specification[Any]) -> dict[str, object]:
hash(spec)
except TypeError:
msg = (
f"Cannot serialize {name}: specification is not hashable. "
f"Use __slots__ for all fields."
)
f"Cannot serialize {name}: specification is not hashable because "
f"a field holds an unhashable value (e.g. a list or dict). "
f"Use hashable values like tuple or frozenset."
)
raise TypeError(msg) from None
data: dict[str, object] = {"type": name}
for s in slots_of(spec):
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