r><dl><dt class="spec value" id="val-fail"><a href="#val-fail" class="anchor"></a><code><span class="keyword">let</span> fail: Migrate_parsetree.Ast_406.Location.t <span>=&gt;</span> string <span>=&gt;</span> <span class="type-var">'a</span>;</code></dt><dt class="spec value" id="val-mk_func"><a href="#val-mk_func" class="anchor"></a><code><span class="keyword">let</span> mk_func: loc:Migrate_parsetree.Ast_406.Location.t <span>=&gt;</span> Migrate_parsetree.Ast_406.Longident.t <span>=&gt;</span> Ast_406.Par