Use obtain result in fold

[Primetalk]

Fix #42

[codecov]

Codecov Report

Merging #44 (180fed3) into master (73bff84) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   83.82%   83.78%   -0.04%     
==========================================
  Files          30       30              
  Lines        1292     1289       -3     
==========================================
- Hits         1083     1080       -3     
  Misses        183      183              
  Partials       26       26              

Impacted Files	Coverage Δ
stream/pool.go	100.00% <ø> (ø)
io/continuation.go	70.58% <100.00%> (+1.83%)	⬆️
io/io.go	76.60% <100.00%> (-0.54%)	⬇️

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