fix corner case in ie (#5959)

fixes #5958
mishoo · Oct 30, 2024 · 9d148fb · 9d148fb
1 parent 0acdd83
commit 9d148fb
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diff --git a/lib/compress.js b/lib/compress.js
@@ -14372,6 +14372,7 @@ Compressor.prototype.compress = function(node) {
                 if (!all(def.orig, function(sym) {
                     if (sym instanceof AST_SymbolConst) return false;
                     if (sym instanceof AST_SymbolFunarg) return !sym.unused && def.scope.resolve() !== fn;
+                    if (sym instanceof AST_SymbolLambda) return !compressor.option("ie") || sym.scope === def.scope;
                     if (sym instanceof AST_SymbolLet) return false;
                     return true;
                 })) return;

diff --git a/test/compress/ie.js b/test/compress/ie.js
@@ -3474,3 +3474,40 @@ issue_5350_ie: {
     }
     expect_stdout: "undefined 42"
 }
+
+issue_5958: {
+    options = {
+        dead_code: true,
+        evaluate: true,
+        ie: true,
+        inline: true,
+        loops: true,
+        sequences: true,
+        toplevel: true,
+    }
+    input: {
+        "use strict";
+        while (function() {
+            if (a === console.log("PASS")) {
+                var a = function b() {};
+                try {
+                    a++;
+                } catch (b) {
+                    b[a];
+                }
+            }
+        }());
+    }
+    expect: {
+        "use strict";
+        if (a = void 0, a === console.log("PASS")) {
+            var a = function b() {};
+            try {
+                a++;
+            } catch (b) {
+                b[a];
+            }
+        }
+    }
+    expect_stdout: "PASS"
+}