reduce this in block scopes (#2526)

fixes #2455
2017-11-28 22:54:21 +08:00
parent 37cbd7080c
commit 62d2817d6c
4 changed files with 24 additions and 8 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4645,8 +4645,10 @@ merge(Compressor.prototype, {
                var init;
                if (fixed instanceof AST_This) {
                    if (!(d.orig[0] instanceof AST_SymbolFunarg)
-                        && all(d.references, function(ref) {
+                        && all(d.references, d.scope.is_block_scope() ? function(ref) {
                            return d.scope === ref.scope;
+                        } : function(ref) {
+                            return d.scope === ref.scope.get_defun_scope();
                        })) {
                        init = fixed;
                    }