[thomasahle]

Russ Cox has some nice examples of the issues with this:

    Otherwise the meaning of &f().x is different for f() returning pointer-to-struct and f() returning struct.
    Similarly &m["x"] is a compile error today but would silently make a copy tomorrow rather than produce a pointer to the value in a map.
    All of that would be incredibly confusing and the source of many subtle bugs.