Bug 18711 – Suggest to slice a static array when the called function would accept it

From the NG (https://forum.dlang.org/post/[email protected]). The following correctly errors: wchar[10] buffer; toUTF8(buffer); However, the error message is a bit cryptic for newcomers: Error: template `std.utf.toUTF8` cannot deduce function from argument types `!()(wchar[10])`, candidates are: /dlang/dmd/linux/bin64/../../src/phobos/std/utf.d(2713): `std.utf.toUTF8(S)(S s) if (isInputRange!S && !isInfinite!S && isSomeChar!(ElementEncodingType!S))` DMD could detect that toUTF8 would accept `buffer[]` and could suggest this to the user.

Currently, the compiler shows the failing constraint so I think that this is more than enough.