In `tryMap`, switch to `as!` when converting error.
In `tryMap`, switch to `as!` when converting error.

ikesyo/Result,natestedman/Result,NachoSoto/Result,natestedman/Result,ratkins/Result,ikesyo/Result,antitypical/Result,ratkins/Result,ikesyo/Result,antitypical/Result,NachoSoto/Result,natestedman/Result,ratkins/Result,NachoSoto/Result,antitypical/Result