Documentation for postfix
.& assembled from the following types:
The operator to call a subroutine (with at least one positional argument), such as a method. The invocant will be bound to the first positional argument.
Technically, not a real operator; it's syntax special-cased in the compiler.
my sub f()42.;# OUTPUT: «The arg has a value of 42␤»42.&(-> );# OUTPUT: «The arg has a value of 42␤»