* Remove define nimExperimentalAsyncjsThen for std/asyncjs.then and std/jsfetch
* Remove define nimExperimentalAsyncjsThen for std/asyncjs.then and std/jsfetch
* Remove define nimExperimentalAsyncjsThen for std/asyncjs.then and std/jsfetch
* Remove define nimExperimentalAsyncjsThen for std/asyncjs.then and std/jsfetch
* followup #16871 asyncjs.then: allow pipelining procs returning futures
* rename test files where they belong
* fix tests
* tests for then with `onReject` callback
* rename test file containing fail to avoid messing with grep
* address comments
* cleanup
* un-disable 1 test
* Minor fixes for asyncjs
Mark internal procedures as used
Allow .async. for more node kinds
Make .async. work for nkStmtList
* Fix logic error in both the async macros