https://issues.dlang.org/show_bug.cgi?id=14769
--- Comment #1 from Kenji Hara <[email protected]> --- (In reply to Simon Sigurdhsson from comment #0) > The following fails to compile, with the error "Error: template > std.conv.toImpl cannot deduce function from argument types !(S2)(string)" > (i.e. S1 works fine, but S2 doesn't): S2 is a nested struct and you can create the instance only inside the enclosing unittest, because it requires valid context. Therefore, to!S2 function cannot create it. > Moving the struct definitions out of the unittest block also works fine: Moving declarations out of the unittest will make S2 non-nested. Then the limitation will be lifted. A quick workaround is adding `static` to struct S2. --
