parse self-nested generic struct

[sdghchj]

Describe the PR
This PR aims to parse self-nested generic struct

Relation issue
#1408

[codecov]

Codecov Report

Base: 85.22% // Head: 85.16% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (80f69d1) compared to base (7c20f30).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 80f69d1 differs from pull request most recent head 9a343de. Consider uploading reports for the commit 9a343de to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1420      +/-   ##
==========================================
- Coverage   85.22%   85.16%   -0.07%     
==========================================
  Files          19       19              
  Lines        3635     3613      -22     
==========================================
- Hits         3098     3077      -21     
+ Misses        459      458       -1     
  Partials       78       78              

Impacted Files	Coverage Δ
generics.go	100.00% <100.00%> (ø)
operation.go	96.10% <100.00%> (-0.17%)	⬇️
parser.go	94.55% <100.00%> (+0.16%)	⬆️

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