The use of three macros with variadic arguments was added to src/test/mempool_test.cpp in https://github.com/bitcoin/bitcoin/commit/f77e1d34fd5f17304ce319b5f962b8005592501a. 

The three macros below generate a compiler error with MSVC.

`#define MK_OUTPUTS(amounts...) std::vector<CAmount>{amounts}`
`#define MK_INPUTS(txs...) std::vector<CTransactionRef>{txs}`
`#define MK_INPUT_IDX(idxes...) std::vector<uint32_t>{idxes}`

The easy fix is to add a ',' after the named argument as per:

`#define MK_OUTPUTS(amounts,...) std::vector<CAmount>{amounts}`
`#define MK_INPUTS(txs,...) std::vector<CTransactionRef>{txs}`
`#define MK_INPUT_IDX(idxes,...) std::vector<uint32_t>{idxes}`

I don't know if that will break any other compilers.

If I had a spare 198 Swiss Francs I'd buy the C standard and check which is the correct approach, https://www.iso.org/standard/57853.html, but I don't.



txGrandChild[i].vout[0].nValue = 11000LL;
    }
    CTxMemPool testPool;
    
    unsigned int poolSize = testPool.size();
    testPool.removeRecursive(txParent);
    BOOST_CHECK_EQUAL(testPool.size(), poolSize);
    
    testPool.addUnchecked(txParent.GetHash(), entry.FromTx(txParent));
    poolSize = testPool.size();
    testPool.removeRecursive(txParent);
    BOOST_CHECK_EQUAL(testPool.size(), poolSize - 1);
    
    
    testPool.addUnchecked(txParent.GetHash(), entry.FromTx(txParent));
    for (int i = 0; i < 3; i++)
    {
        testPool.addUnchecked(txChild[i].GetHash(), entry.FromTx(txChild[i]));
        testPool.addUnchecked(txGrandChild[i].GetHash(), entry.FromTx(txGrandChild[i]));
    }
    
    poolSize = testPool.size();
    testPool.removeRecursive(txChild[0]);
    BOOST_CHECK_EQUAL(testPool.size(), poolSize - 2);
    
    poolSize = testPool.size();
    testPool.removeRecursive(txGrandChild[0]);
    BOOST_CHECK_EQUAL(testPool.size(), poolSize);
    poolSize = testPool.size();
    testPool.removeRecursive(txChild[0]);