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getDoc: Explain why we partially apply __functor

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Robert Hensing 2024-08-26 16:15:13 +02:00 committed by GitHub
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5
src/libexpr/eval.cc
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@ -621,6 +621,11 @@ std::optional<EvalState::Doc> EvalState::getDoc(Value & v)
Value & functor = *v.attrs()->find(sFunctor)->value;
Value * vp = &v;
Value partiallyApplied;
// The first paramater is not user-provided, and may be
// handled by code that is opaque to the user, like lib.const = x: y: y;
// So preferably we show docs that are relevant to the
// "partially applied" function returned by e.g. `const`.
// We apply the first argument:
callFunction(functor, 1, &vp, partiallyApplied, noPos);
auto _level = addCallDepth(noPos);
return getDoc(partiallyApplied);