On Monday, 18 May 2015 at 18:35:04 UTC, Ali Çehreli wrote:
converted to a static assert. Still though, there is no guarantee that "int" matches what is yielded.

Couldn't `yield()` capture CT-attributes of the calling function, in this case `fibonacciSeries`, and propagate them via default values of template arguments like is done in, for instance,

void contextual_writeln(string file = __FILE__,
                        uint line = __LINE__,
                        string fun = __FUNCTION__, T...)(T t)
    import std.stdio: writeln;
try { writeln(file, ":",line, ":"/* , ": in ",fun */, " debug: ", t); }
    catch (Exception) { }

and use them to match the type of the argument to yield at compile-time? AFAIK everything visible by the compiler such UDA of functions could be put in a template argument either as a template alias or string parameter.

If not, isn't it time for a specific keyword for spawning threads and/or fibers? Contentenders could be `yield`, `go`, `co`, `spawn`. I'm aware of the problem with new keywords conflicting with existing symbols but that could be solved with deprecation phase so people can fix their code.

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