The catch statement does not specify the type of associated exception

[LaurentDardenne]

With

catch [System.Management.Automation.CommandNotFoundException] {"Command error trapped"};catch  {"Command error trapped"}

While the Trap statement considers the type of the exception

trap [System.Management.Automation.CommandNotFoundException] {"Command error trapped"}

But in this case it is a value (a type) and not a constraint

[Jawz84]

Trapdoes not have an explanation in code yet, but try {}; catch {} does, I think I may have changed the behaviour there, or, possibly the type constraint is handled differently in the Ast there.
Good one. Needs further attention