replace bc.imports[] with findImport

[JessonChan]

#1063

[codecov-commenter]

Codecov Report

Merging #1064 (1cfb950) into main (0c51ae4) will decrease coverage by 0.05%.
The diff coverage is 63.15%.

@@            Coverage Diff             @@
##             main    #1064      +/-   ##
==========================================
- Coverage   85.75%   85.70%   -0.06%     
==========================================
  Files          23       23              
  Lines        9535     9548      +13     
==========================================
+ Hits         8177     8183       +6     
- Misses       1083     1089       +6     
- Partials      275      276       +1     

Impacted Files	Coverage Δ
cl/compile.go	96.64% <46.15%> (-1.13%)	⬇️
cl/expr.go	94.90% <100.00%> (ø)
cl/func_type_and_var.go	97.64% <100.00%> (ø)

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