From fb0f8fb8999c4fd9f8f07f45fb44e3d0099506e1 Mon Sep 17 00:00:00 2001
From: alexlamsl <alexlamsl@gmail.com>
Date: Mon, 18 Dec 2017 05:14:11 +0800
Subject: [PATCH] compress `function.call()`

---
 lib/compress.js            | 11 +++++++++++
 test/compress/functions.js | 26 ++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/lib/compress.js b/lib/compress.js
index 52c30964..2830c595 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3846,6 +3846,17 @@ merge(Compressor.prototype, {
                     }
                 }
                 break;
+              case "call":
+                if (exp.expression instanceof AST_Function && !exp.expression.contains_this()) {
+                    return make_sequence(this, [
+                        self.args[0],
+                        make_node(AST_Call, self, {
+                            expression: exp.expression,
+                            args: self.args.slice(1)
+                        })
+                    ]).optimize(compressor);
+                }
+                break;
             }
         }
         if (compressor.option("unsafe_Func")
diff --git a/test/compress/functions.js b/test/compress/functions.js
index 5f7fba6b..35ea3d4e 100644
--- a/test/compress/functions.js
+++ b/test/compress/functions.js
@@ -923,3 +923,29 @@ issue_2604_2: {
     }
     expect_stdout: "PASS"
 }
+
+unsafe_call: {
+    options = {
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+        side_effects: true,
+        unsafe: true,
+        unused: true,
+    }
+    input: {
+        (function(a, b) {
+            console.log(a, b);
+        }).call("foo", "bar");
+        (function(a, b) {
+            console.log(this, a, b);
+        }).call("foo", "bar");
+    }
+    expect: {
+        console.log("bar", void 0);
+        (function(a, b) {
+            console.log(this, a, b);
+        }).call("foo", "bar");
+    }
+    expect_stdout: true
+}