public void visitStackManipStmt(final StackManipStmt stmt) {
		for (int i = 0; i < stmt.target.length; i++) {
			if (stmt.target[i] == from) {
				stmt.target[i] = (StackExpr) to;
				((Expr) to).setParent(stmt);
				return;
			}
		}

		for (int i = 0; i < stmt.source.length; i++) {
			if (stmt.source[i] == from) {
				stmt.source[i] = (StackExpr) to;
				((Expr) to).setParent(stmt);
				return;
			}
		}

		stmt.visitChildren(this);
	}