fix boolean context detection (#3466)

fixes #3465

lib/ast.js

@@ -985,6 +985,7 @@ TreeWalker.prototype = {
                     fn = this.parent(++i);
                     if (!fn) return false;
                 } while (!(fn instanceof AST_Lambda));
+                if (fn.name) return false;
                 self = this.parent(++i);
                 if (!self || self.TYPE != "Call" || self.expression !== fn) return false;
             } else {