oare triple. In other words, <code>exec_instr</code> defines how executing an instruction from a given abstract state changes that state into a new one. This is usually called the <i>transfer function</i> in Abstract Interpretation terms. <code>node</code> is the node containing the current instruction and <code>idx</code> is the index of the instruction in the node.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-pp_session_name"><a href="#val-pp_session_name" class="anchor">