bad-copies.nim

var globalFiles: seq[FileInfo]

proc getFileName(i: int): string =
  return globalFiles[i].name # unnecessary copy (life-time of the global exceeds any caller score)

type
  TFoo = object
    data: string

  TBar = object
    sortedFoos: seq[TFoo]
    

proc FindFooFata(b: TBar): string =
  ...
  return b.sortedFoos[12].data # unnecessary copy
                               # (the final value is effectively owned by the 'b' param and its lifetime
                               # is guaranteed to be within the bounds of the 'b' lifetime