Make prefix // working again

Somehow this was missed by an internal reorganization on language
versions.  Lack of tests is probably the reason :-(

Also make sure prefix // has the same precedence as prefix +

src/Perl6/Grammar.nqp

@@ -3511,9 +3511,9 @@ grammar Perl6::Grammar is HLL::Grammar does STD {
 
     token quote:sym</null/> {
         :my $rev := nqp::getcomp('Raku').language_revision;
-          <?{ $rev lt 'e' }>
+          <?{ $rev < 3 }>
           '/' \s* '/' <.typed_panic: "X::Syntax::Regex::NullRegex">
-        | <?{ $rev ge 'e' }>
+        | <?{ $rev >= 3 }>
           '/' \s+ '/' <.typed_panic: "X::Syntax::Regex::NullRegex">
     }
     token quote:sym</ />  {
@@ -4102,7 +4102,7 @@ grammar Perl6::Grammar is HLL::Grammar does STD {
     }
     token prefix:sym<⚛>   { <sym>  <O(|%symbolic_unary)> }
     token prefix:sym<//>  {
-        <?{ nqp::getcomp('Raku').language_revision ge 'e' }>
+        <?{ nqp::getcomp('Raku').language_revision >= 3 }>
         <sym> <O(|%symbolic_unary)>
     }
 

src/core.e/control.pm6

@@ -1,7 +1,7 @@
 multi sub next(\x --> Nil) { THROW(nqp::const::CONTROL_NEXT, x) }
 multi sub last(\x --> Nil) { THROW(nqp::const::CONTROL_LAST, x) }
 
-proto sub prefix:<//>($) is pure {*}
+proto sub prefix:<//>($) is pure is equiv(&prefix:<+>) {*}
 multi sub prefix:<//>(\a) { a.defined }
 
 # vim: expandtab shiftwidth=4