Hide Explode.rsc file from previous version of the checker because it uses the new syntax for role modifiers too soon

Author: jurgenvinju

…c/org/rascalmpl/library/util/Explode.rsc …/rascalmpl/library/util/Explode.rsc-hidesrc/org/rascalmpl/library/util/Explode.rsc renamed to src/org/rascalmpl/library/util/Explode.rsc-hide src/org/rascalmpl/library/util/Explode.rsc renamed to src/org/rascalmpl/library/util/Explode.rsc-hide

@@ -181,4 +181,4 @@ private loc pos(loc _span, [node n])             = \loc(n);
 private loc pos(loc _span, [node a, *_, node b]) = cover([\loc(a), \loc(b)]);
 
 @synopsis{Waiting for `node.src` to be available in Rascal for good...}
-private loc \loc(node n) = l when loc l := n.src;
+private loc \loc(node n) = l when loc l := n.src;