$is_const
@is_const
$defined
`$foo` variables could be assigned non-compile time values. `$foo[0] = ...` was incorrectly requiring that the assigned values were compile time constants.
foo[1..2] = bar[..]
foo[1..2] = bar
--use-old-slice-copy
@return!
cleanup
os::exit
os::fastexit
$Type
$assignable