tests: add notes about broken `hg log --follow <file>` with copies in extras
I also removed some unnecessary `#if no-changeset` where the `#else`
was the same :P
Differential Revision: https://phab.mercurial-scm.org/D9204
#ifndef CONTRIB_FUZZ_FUZZUTIL_H
#define CONTRIB_FUZZ_FUZZUTIL_H
#include <iostream>
#include <memory>
#include <stdint.h>
/* Try and use std::optional, but failing that assume we'll have a
* workable https://abseil.io/ install on the include path to get
* their backport of std::optional. */
#ifdef __has_include
#if __has_include(<optional>) && __cplusplus >= 201703L
#include <optional>
#define CONTRIB_FUZZ_HAVE_STD_OPTIONAL
#endif
#endif
#ifdef CONTRIB_FUZZ_HAVE_STD_OPTIONAL
namespace contrib
{
using std::nullopt;
using std::optional;
} /* namespace contrib */
#else
#include "third_party/absl/types/optional.h"
namespace contrib
{
using absl::nullopt;
using absl::optional;
} /* namespace contrib */
#endif
/* set DEBUG to 1 for a few debugging prints, or 2 for a lot */
#define DEBUG 0
#define LOG(level) \
if (level <= DEBUG) \
std::cout
#endif /* CONTRIB_FUZZ_FUZZUTIL_H */