diff --git a/src/core.c/OperatorProperties.pm6 b/src/core.c/OperatorProperties.pm6
new file mode 100644
index 00000000000..fc7e3114487
--- /dev/null
+++ b/src/core.c/OperatorProperties.pm6
@@ -0,0 +1,129 @@
+class OperatorProperties {
+    has str $.precedence  = "";
+    has str $.associative = "";
+    has str $.thunky      = "";
+    has int $.iffy;
+
+    # shorten signatures and invocations
+    my constant OP = OperatorProperties;
+
+    multi method WHICH(OP:D: --> ValueObjAt) {
+        my $parts := nqp::list_s('OperatorProperties');
+
+        nqp::push_s($parts,nqp::concat('precedence=',$!precedence))
+          if $!precedence;
+        nqp::push_s($parts,nqp::concat('associative=',$!associative))
+          if $!associative;
+        nqp::push_s($parts,nqp::concat('thunky=',$!thunky))
+          if $!thunky;
+        nqp::push_s($parts,nqp::concat('iffy=',$!iffy))
+          if $!iffy;
+
+        nqp::box_s(nqp::join('|',$parts),ValueObjAt)
+    }
+
+    method equiv(OP:D:) {
+        self.new: :$!precedence,
+          :associative(''), :$!thunky, :$!iffy
+    }
+    method looser(OP:D:) {
+        self.new: precedence => $!precedence.subst('=','@='),
+          :associative(''), :$!thunky, :$!iffy
+    }
+    method tighter(OP:D:) {
+        self.new: precedence => $!precedence.subst('=',':=')
+          :associative(''), :$!thunky, :$!iffy
+    }
+
+    method prec() {
+        Map.new:
+          (prec   => $!precedence  if $!precedence),
+          (assoc  => $!associative if $!associative),
+          (thunky => $!thunky      if $!thunky),
+          (iffy   => $!iffy)
+    }
+
+    method methodcall(OP:U:) { OP.new:
+        :precedence<y=>
+    }
+    method autoincrement(OP:U:) { OP.new:
+        :precedence<x=>
+    }
+    method exponentiation(OP:U:) { OP.new:
+        :precedence<w=>, :associative<left>
+    }
+    method symbolic-unary(OP:U:) { OP.new:
+        :precedence<v=>
+    }
+    method multiplicative(OP:U:) { OP.new:
+        :precedence<u=>, :associative<left>
+    }
+    method iffytive(OP:U:) { OP.new:
+        :precedence<u=>, :associative<left>, :iffy
+    }
+    method additive(OP:U:) { OP.new:
+        :precedence<t=>, :associative<left>
+    }
+    method replication(OP:U:) { OP.new:
+        :precedence<s=>, :associative<left>
+    }
+    method replication-xx(OP:U:) { OP.new:
+        :precedence<s=>, :associative<left>, :thunky<t.>
+    }
+    method concatenation(OP:U:) { OP.new:
+        :precedence<r=>, :associative<list>
+    }
+    method junctive-and(OP:U:) { OP.new:
+        :precedence<q=>, :associative<list>
+    }
+    method junctive-or(OP:U:) { OP.new:
+        :precedence<p=>, :associative<list>
+    }
+    method structural(OP:U:) { OP.new:
+        :precedence<n=>, :associative<non>
+    }
+    method chaining(OP:U:) { OP.new:
+        :precedence<m=>, :associative<chain>, :iffy
+    }
+    method tight-and(OP:U:) { OP.new:
+        :precedence<l=>, :associative<list>, :thunky<.t>
+    }
+    method tight-or(OP:U:) { OP.new:
+        :precedence<k=>, :associative<list>, :thunky<.t>
+    }
+    method tight-or-xor(OP:U:) { OP.new:
+        :precedence<k=>, :associative<list>, :thunky<..t>
+    }
+    method tight-or-minmax(OP:U:) { OP.new:
+        :precedence<k=>, :associative<list>
+    }
+    method item-assignment(OP:U:) { OP.new:
+        :precedence<i=>, :associative<right>
+    }
+    method loose-unary(OP:U:) { OP.new:
+        :precedence<h=>
+    }
+    method comma(OP:U:) { OP.new:
+        :precedence<g=>, :associative<list>
+    }
+    method list-infix(OP:U:) { OP.new:
+        :precedence<f=>, :associative<list>
+    }
+    method list-prefix(OP:U:) { OP.new:
+        :precedence<e=>
+    }
+    method loose-and(OP:U:) { OP.new:
+        :precedence<d=>, :associative<list>, :thunky<.t>
+    }
+    method loose-andthen(OP:U:) { OP.new:
+        :precedence<d=>, :associative<list>, :thunky<.b>
+    }
+    method loose-or(OP:U:) { OP.new:
+        :precedence<c=>, :associative<list>, :thunky<.t>
+    }
+    method loose-orelse(OP:U:) { OP.new:
+        :precedence<c=>, :associative<list>, :thunky<.b>
+    }
+}
+
+# vim: expandtab shiftwidth=4