minor

lib/compress.js

@@ -833,17 +833,17 @@ function Compressor(options, false_by_default) {
             && index < block.length - 1) {
             if (compressor.parent() instanceof AST_Lambda) {
                 var rest = tighten_body(block.slice(index + 1), compressor);
-                var cond = negated_is_best ? negated : self.condition.negate(compressor);
+                var cond = self.condition;
                 while (rest[0] instanceof AST_If && rest[0].body instanceof AST_Return && !rest[0].alternative) {
                     cond = make_node(AST_Binary, rest[0], {
-                        operator: "&&",
+                        operator: "||",
                         left: cond,
-                        right: rest[0].condition.negate(compressor)
+                        right: rest[0].condition
                     });
                     rest.shift();
                 }
                 return MAP.last(make_node(AST_If, self, {
-                    condition: cond,
+                    condition: cond.negate(compressor),
                     body: make_node(AST_BlockStatement, block[index + 1], {
                         body: rest
                     }).optimize(compressor)