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let
Combined from primary sources listed below.

In Operators§

See primary documentation in context for prefix let. 

sub prefix:<let>(Mu $a is rw)

Refers to a variable in an outer scope whose value will be restored if the block exits unsuccessfully, implying that the block returned a defined object.

my $name = "Jane Doe";

{
    let $name = prompt("Say your name ");
    die if !$name;
    CATCH {
        default { say "No name entered" }
    }
    say "We have $name";
}

say "We got $name";

This code provides a default name for $name. If the user exits from the prompt or simply does not provide a valid input for $name; let will restore the default value provided at the top. If user input is valid, it will keep that.