zhangzhishan: check if it is assignment to self

[qchateau]

No description provided.

[codecov-io]

Codecov Report

Merging #6 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   96.77%   96.77%   +<.01%     
==========================================
  Files          38       38              
  Lines        1146     1147       +1     
==========================================
+ Hits         1109     1110       +1     
  Misses         37       37

Impacted Files	Coverage Δ
lib/rpc/server.cc	95.45% <100%> (+0.05%)	⬆️

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