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if (my @f = some_code())
{
  # use @f here
}
# but not here

if ((my @f = some_code()) == 1 || (@f = some_other_code()) == 1)
{
  # I only expect one item back.  Use $f[0] here.
}

if ((my @f = some_code()) == 1 || (my @f = some_other_code()) == 1)

{
 my @f;
...
  #...
 }
}