From 903a5df9a5bfcaac6cc6da8294f3de8599004a23 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sat, 11 Apr 2020 12:54:26 +0100
Subject: fix corner case in `inline` (#3778)

fixes #3777
---
 lib/compress.js | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

(limited to 'lib/compress.js')

diff --git a/lib/compress.js b/lib/compress.js
index 98724bd0..e5b7bf09 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -5820,7 +5820,7 @@ merge(Compressor.prototype, {
             }
         }
         if (is_func) {
-            var def, value;
+            var def, value, var_assigned = false;
             if (can_inline
                 && !fn.uses_arguments
                 && !fn.pinned()
@@ -5909,10 +5909,12 @@ merge(Compressor.prototype, {
             for (var i = 0; i < len; i++) {
                 var line = fn.body[i];
                 if (line instanceof AST_Var) {
-                    if (stat && !all(line.definitions, function(var_def) {
+                    var assigned = var_assigned || !all(line.definitions, function(var_def) {
                         return !var_def.value;
-                    })) {
-                        return false;
+                    });
+                    if (assigned) {
+                        var_assigned = true;
+                        if (stat) return false;
                     }
                 } else if (line instanceof AST_Defun || line instanceof AST_EmptyStatement) {
                     continue;
@@ -5932,15 +5934,11 @@ merge(Compressor.prototype, {
         }
 
         function can_substitute_directly() {
+            if (var_assigned) return;
             if (compressor.option("inline") <= 1 && fn.argnames.length) return;
-            var var_count = fn.variables.size() - 1;
-            if (var_count > fn.argnames.length) return;
-            var var_names = [];
-            if (!all(fn.argnames, function(argname) {
-                push_uniq(var_names, argname.name);
-                return argname.definition().references.length < 2;
+            if (!fn.variables.all(function(def) {
+                return def.references.length < 2 && def.orig[0] instanceof AST_SymbolFunarg;
             })) return;
-            if (var_count > var_names.length) return;
             var abort = false;
             var begin;
             var in_order = [];
-- 
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