Made IdentOrIndex cloneable

[VictorKoenders]

Closes #66

[codecov]

Codecov Report

Patch coverage: 77.77% and project coverage change: +0.02 🎉

Comparison is base (c194f91) 48.00% compared to head (b14216c) 48.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk      #67      +/-   ##
==========================================
+ Coverage   48.00%   48.03%   +0.02%     
==========================================
  Files          20       20              
  Lines        2058     2057       -1     
==========================================
  Hits          988      988              
+ Misses       1070     1069       -1     

Impacted Files	Coverage Δ
src/parse/attributes.rs	47.36% <ø> (ø)
src/parse/body.rs	78.98% <75.00%> (+0.25%)	⬆️
src/parse/generics.rs	71.42% <100.00%> (ø)

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