Return of bug#6554 (Compiler error dereferencing multi_array value via an iterator)

[krsch]

The bug described in https://svn.boost.org/trac10/ticket/6554 seems to return. I tried the example from this bug in godbolt: https://godbolt.org/z/4vMf8oo4q and it fails to compile. The code I used is:

#include <boost/multi_array.hpp>

struct data
{
	int	value;
};
typedef boost::multi_array<data, 2> array_type;

int main() {
    array_type	a(boost::extents[4][5]);

    // ERROR: Cannot compile this line
    a.begin()->begin()->value = 7;

    // Compiles successfully
    (*a.begin()->begin()).value = 5;
    return 0;
}

All versions of boost on godbolt (1.64 to 1.79) seem to be affected.

[krsch]

Or was this bug never fixed?

[krsch]

I found no tests covering operator->. I can try to fix this bug myself, but I'm afraid to break some code when to tests are present.