if
syntax modifier thunky
execute thunk if condition is true
https://docs.raku.org/language/control#if
Executes the thunk if the condition is true.

unless
syntax modifier thunky
execute thunk if condition is false
https://docs.raku.org/language/control#unless
Executes the thunk if the condition is false.

with
syntax modifier thunky
execute thunk set if value is defined, and set topic
https://docs.raku.org/language/control#with_orwith_without
Execute thunk if given expression produces a defined value,
sets topic inside thunk.

without
syntax modifier thunky
execute thunk if value is not defined, and set topic
https://docs.raku.org/language/control#with_orwith_without
Execute thunk if given expression does B<not> produce a defined
value, sets topic inside thunk.

when
syntax modifier thunky topic
execute thunk if value smartmatches with the topic
https://docs.raku.org/language/control#when
Execute thunk if given expression smartmatches with the topic
(C<$_>).


contains the statement modifiers to indicate conditional execution
of the preceding thunk.
