enhance `inline` (#3352)

2 files changed, 29 insertions, 1 deletions

diff --git a/lib/compress.js b/lib/compress.js
index 778d7fa9..fe6e72d1 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -5072,7 +5072,7 @@ merge(Compressor.prototype, {
                 }
             } while (!(scope instanceof AST_Scope));
             var safe_to_inject = (!(scope instanceof AST_Toplevel) || compressor.toplevel.vars)
-                && fn.parent_scope === compressor.find_parent(AST_Scope);
+                && (exp !== fn || fn.parent_scope === compressor.find_parent(AST_Scope));
             var inline = compressor.option("inline");
             if (!can_inject_vars(catches, inline >= 3 && safe_to_inject)) return false;
             if (!can_inject_args(catches, inline >= 2 && safe_to_inject)) return false;
diff --git a/test/compress/functions.js b/test/compress/functions.js
index a52796c2..cb7a1b86 100644
--- a/test/compress/functions.js
+++ b/test/compress/functions.js
@@ -2675,3 +2675,31 @@ cross_references_3: {
         "9 27",
     ]
 }
+
+loop_inline: {
+    options = {
+        inline: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function(o) {
+            function g(p) {
+                return o[p];
+            }
+            function h(q) {
+                while (g(q));
+            }
+            return h;
+        }([ 1, "foo", 0 ])(2));
+    }
+    expect: {
+        console.log(function(o) {
+            return function(q) {
+                while (p = q, o[p]);
+                var p;
+            };
+        }([ 1, "foo", 0 ])(2));
+    }
+    expect_stdout: "undefined"
+}