On Thursday, 8 July 2021 at 22:24:26 UTC, Antonio wrote: > I supossed that ```mfp(c,20)``` and ```c.mfp(20)``` should be > equivalent because UFCS in second example, but it is not... why? UFCS only works with functions defined at top level, not nested inside other functions. That's just how it is defined i don't really know why.