From 91cae51d8f8a7f06e55dba7d100bbb663448875b Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Wed, 16 Oct 2019 01:09:16 +0800
Subject: [PATCH] fix corner case in `evaluate` & `ie8` (#3483)

fixes #3482
---
 lib/scope.js         |   1 +
 test/compress/ie8.js | 166 +++++++++++++++++++++++++++++++++++++------
 2 files changed, 145 insertions(+), 22 deletions(-)

diff --git a/lib/scope.js b/lib/scope.js
index 01a67b7dbd..038dd640c5 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -216,6 +216,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
             node.reference(options);
         });
         if (old_def.lambda) new_def.lambda = true;
+        if (new_def.undeclared) self.variables.set(name, new_def);
     }
 });
 
diff --git a/test/compress/ie8.js b/test/compress/ie8.js
index f371bbf0ab..e57c233ed9 100644
--- a/test/compress/ie8.js
+++ b/test/compress/ie8.js
@@ -125,28 +125,36 @@ do_screw_try_catch_undefined: {
         ie8: false,
     }
     input: {
-        function a(b){
+        function a(b) {
             try {
-                throw 'Stuff';
+                throw "Stuff";
             } catch (undefined) {
-                console.log('caught: ' + undefined);
+                console.log("caught: " + undefined);
             }
-            console.log('undefined is ' + undefined);
+            console.log("undefined is " + undefined);
             return b === undefined;
-        };
+        }
+        console.log(a(42), a(void 0));
     }
     expect: {
-        function a(o){
+        function a(o) {
             try {
-                throw "Stuff"
+                throw "Stuff";
             } catch (o) {
-                console.log("caught: "+o)
+                console.log("caught: " + o);
             }
             console.log("undefined is " + void 0);
-            return void 0===o
+            return void 0 === o;
         }
-    }
-    expect_stdout: true
+        console.log(a(42), a(void 0));
+    }
+    expect_stdout: [
+        "caught: Stuff",
+        "undefined is undefined",
+        "caught: Stuff",
+        "undefined is undefined",
+        "false true",
+    ]
 }
 
 dont_screw_try_catch_undefined: {
@@ -160,28 +168,37 @@ dont_screw_try_catch_undefined: {
         ie8: true,
     }
     input: {
-        function a(b){
+        function a(b) {
             try {
-                throw 'Stuff';
+                throw "Stuff";
             } catch (undefined) {
-                console.log('caught: ' + undefined);
+                console.log("caught: " + undefined);
             }
-            console.log('undefined is ' + undefined);
+            // IE8: undefined is Stuff
+            console.log("undefined is " + undefined);
             return b === undefined;
-        };
+        }
+        console.log(a(42), a(void 0));
     }
     expect: {
-        function a(n){
+        function a(n) {
             try {
-                throw "Stuff"
+                throw "Stuff";
             } catch (undefined) {
-                console.log("caught: " + undefined)
+                console.log("caught: " + undefined);
             }
             console.log("undefined is " + undefined);
-            return n === undefined
+            return n === undefined;
         }
-    }
-    expect_stdout: true
+        console.log(a(42), a(void 0));
+    }
+    expect_stdout: [
+        "caught: Stuff",
+        "undefined is undefined",
+        "caught: Stuff",
+        "undefined is undefined",
+        "false true",
+    ]
 }
 
 reduce_vars: {
@@ -1561,3 +1578,108 @@ issue_3478_2_ie8_toplevel: {
     }
     expect_stdout: "PASS"
 }
+
+issue_3482_1: {
+    options = {
+        evaluate: true,
+        ie8: false,
+    }
+    input: {
+        try {
+            throw 42;
+        } catch (NaN) {
+            var a = +"a";
+        }
+        console.log(a, NaN, 0 / 0);
+    }
+    expect: {
+        try {
+            throw 42;
+        } catch (NaN) {
+            var a = 0 / 0;
+        }
+        console.log(a, NaN, NaN);
+    }
+    expect_stdout: "NaN NaN NaN"
+}
+
+issue_3482_1_ie8: {
+    options = {
+        evaluate: true,
+        ie8: true,
+    }
+    input: {
+        try {
+            throw 42;
+        } catch (NaN) {
+            var a = +"a";
+        }
+        // IE8: NaN 42 NaN
+        console.log(a, NaN, 0 / 0);
+    }
+    expect: {
+        try {
+            throw 42;
+        } catch (NaN) {
+            var a = 0 / 0;
+        }
+        console.log(a, NaN, 0 / 0);
+    }
+    expect_stdout: "NaN NaN NaN"
+}
+
+issue_3482_2: {
+    options = {
+        evaluate: true,
+        ie8: false,
+    }
+    input: {
+        (function() {
+            try {
+                throw 42;
+            } catch (NaN) {
+                a = +"a";
+            }
+        })();
+        console.log(a, NaN, 0 / 0);
+    }
+    expect: {
+        (function() {
+            try {
+                throw 42;
+            } catch (NaN) {
+                a = 0 / 0;
+            }
+        })();
+        console.log(a, NaN, NaN);
+    }
+    expect_stdout: "NaN NaN NaN"
+}
+
+issue_3482_2_ie8: {
+    options = {
+        evaluate: true,
+        ie8: true,
+    }
+    input: {
+        (function() {
+            try {
+                throw 42;
+            } catch (NaN) {
+                a = +"a";
+            }
+        })();
+        console.log(a, NaN, 0 / 0);
+    }
+    expect: {
+        (function() {
+            try {
+                throw 42;
+            } catch (NaN) {
+                a = 0 / 0;
+            }
+        })();
+        console.log(a, NaN, 0 / 0);
+    }
+    expect_stdout: "NaN NaN NaN"
+}