Eigen 3.4 seems to have a significant change in behavior where begin() exists for all matrices, but returns void for non 1-D matrices where iteration is not well defined.
This currently interferes with the fmt/ranges.h implementation such that the following code compiles with Eigen 3.9, but no longer compiles with 3.4.
#include <Eigen/Core>
#include <fmt/format.h>
#include <fmt/ostream.h>
#include <fmt/ranges.h> // doesn't work if uncomment this
int main() {
Eigen::Matrix3d m;
m << 1, 2, 3, 4, 5, 6, 7, 8, 9;
fmt::print("{}\n", m);
return 0;
}
Note: This was built using the -DFMT_DEPRECATED_OSTREAM compiler flag
<source>:10:13: required from here
/opt/compiler-explorer/libs/fmt/9.1.0/include/fmt/ranges.h:264:34: error: void value not ignored as it ought to be
264 | decltype(*detail::range_begin(std::declval<Range&>()));
Godbolt Example: https://godbolt.org/z/TzG7TMxWx
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