When a macro like this:

(defpsmacro blah (x) 'xyz)

... is shadowed by a local macro like this:

(ps (defun test1 ()
          (macrolet ((blah (x) `(aref data ,x)))
          (when (blah x)
        (setf (blah x) 123)))))

... it's possible to get an inconsistent macroexpansion:

=>

"function test1() {
if (data[x]) {
        xyz = 123;
      };
};

Daniel