fails:Execution variable $: does not include the current directory
fails:Execution variable $: does not include '.' when the taint check level > 1
fails:Global variable $-a is read-only
fails:Global variable $-l is read-only
fails:Global variable $-p is read-only

fails:Predefined global $~ raises an error if assigned an object not nil or instanceof MatchData
fails:Execution variable $: does not include the current directory
fails:Execution variable $: does not include '.' when the taint check level > 1
fails:Global variable $-a is read-only
fails:Global variable $-l is read-only
fails:Global variable $-p is read-only

Tag a few specs in language/predefined
Tag a few specs in language/predefined
