gop.NewImporter: save fset

[xushiwei]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1226 (f285337) into main (7e3a432) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1226      +/-   ##
==========================================
- Coverage   90.59%   90.58%   -0.02%     
==========================================
  Files          22       22              
  Lines        8399     8399              
==========================================
- Hits         7609     7608       -1     
- Misses        635      636       +1     
  Partials      155      155              

Impacted Files	Coverage Δ
cl/stmt.go	93.36% <0.00%> (-0.18%)	⬇️

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