Bug 1611 – State-losing implicit conversions should not be allowed

In the grand tradition of C, many state-losing conversions among integral types are implicit. This emasculates integral types and allows many bugs go by unnoticed. The following program should print nothing: import std.stdio; import std.typetuple; void main() { alias TypeTuple!(byte, ubyte, short, ushort, int, uint, long, ulong, char, wchar, dchar) AllIntegrals; foreach (T1; AllIntegrals) { foreach (T2; AllIntegrals) { static if (is(T1 : T2) && T1.sizeof > T2.sizeof) writeln(T1.stringof, " -> ", T2.stringof); } } } It currently prints 45 lines.

This is by design, but a bad design I agree. Changing to enhancement.

Fixed in 2.031, however incompletely (see e.g. 3147).