Method forceString

src/libexpr/eval.cc:2379–2393

}

std::string_view EvalState::forceString(Value & v, const PosIdx pos, std::string_view errorCtx)
{
    try {
        forceValue(v, pos);
        if (v.type() != nString)
            error<TypeError>(
                "expected a string but found %1%: %2%", showType(v), ValuePrinter(*this, v, errorPrintOptions))
                .atPos(pos)
                .debugThrow();
        return v.string_view();
    } catch (Error & e) {
        e.addTrace(positions[pos], errorCtx);
        throw;
    }
}

void copyContext(const Value & v, NixStringContext & context, const ExperimentalFeatureSettings & xpSettings)
{