From ea5dcc3e712cb3805160d69ba37d20f48891cca5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?F=C3=A1bio=20Santos?= <fabiosantosart@gmail.com>
Date: Tue, 19 Jul 2022 20:24:02 +0100
Subject: [PATCH] avoid inlining `identityFn(...expandedArgs)`. closes #1226

---
 lib/compress/inline.js    |  1 +
 test/compress/identity.js | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/lib/compress/inline.js b/lib/compress/inline.js
index fea4be2a4..eec4c5c91 100644
--- a/lib/compress/inline.js
+++ b/lib/compress/inline.js
@@ -335,6 +335,7 @@ export function inline_into_call(self, fn, compressor) {
             fn.argnames.length === 1
             && (fn.argnames[0] instanceof AST_SymbolFunarg)
             && self.args.length < 2
+            && !(self.args[0] instanceof AST_Expansion)
             && returned instanceof AST_SymbolRef
             && returned.name === fn.argnames[0].name
         ) {
diff --git a/test/compress/identity.js b/test/compress/identity.js
index 49f2b1045..3d00f1164 100644
--- a/test/compress/identity.js
+++ b/test/compress/identity.js
@@ -249,3 +249,18 @@ inline_identity_dont_lose_this_when_arg: {
     }
 }
 
+inline_trivial_fns_unless_arg_is_expansion: {
+    options = {
+        toplevel: true,
+        inline: true,
+    }
+    input: {
+        function n (n) {
+            return n;
+        }
+        (function(...o) {
+            const c=n(...o);console.log(c)
+        })("PASS");
+    }
+    expect_stdout: "PASS"
+}