struct S { int a; } auto s1 = S(); S s2 = s1; // works auto s3 = S(s1); // doesn't work, but should be equivalent to the above ------------ The compiler should rewrite that case to use copy constructor and postblit.
This bug report is invalid. DMD does not have implicit constructors. Blits are made by default if a struct does not define a copy constructor; this behavior is according to the spec. Closing as invalid.