fix corner case in inline (#3608)

lib/compress.js

@@ -6444,6 +6444,15 @@ merge(Compressor.prototype, {
                     fixed = make_node(AST_Function, fixed, fixed);
                     fixed.name = make_node(AST_SymbolLambda, fixed.name, fixed.name);
                 }
+                if (fixed instanceof AST_Lambda) {
+                    var scope = self.scope;
+                    fixed.enclosed.forEach(function(def) {
+                        if (fixed.variables.has(def.name)) return;
+                        if (scope.var_names()[def.name]) return;
+                        scope.enclosed.push(def);
+                        scope.var_names()[def.name] = true;
+                    });
+                }
                 var value;
                 if (def.recursive_refs > 0) {
                     value = fixed.clone(true);

test/compress/functions.js

@@ -3594,3 +3594,165 @@ inline_use_strict: {
     }
     expect_stdout: "foobar"
 }
+
+pr_3595_1: {
+    options = {
+        collapse_vars: false,
+        inline: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var g = [ "PASS" ];
+        function problem(arg) {
+            return g.indexOf(arg);
+        }
+        function unused(arg) {
+            return problem(arg);
+        }
+        function a(arg) {
+            return problem(arg);
+        }
+        function b(problem) {
+            return g[problem];
+        }
+        function c(arg) {
+            return b(a(arg));
+        }
+        console.log(c("PASS"));
+    }
+    expect: {
+        var g = [ "PASS" ];
+        function problem(arg) {
+            return g.indexOf(arg);
+        }
+        console.log((arg = "PASS", function(problem) {
+            return g[problem];
+        }(function(arg) {
+            return problem(arg);
+        }(arg))));
+        var arg;
+    }
+    expect_stdout: "PASS"
+}
+
+pr_3595_2: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var g = [ "PASS" ];
+        function problem(arg) {
+            return g.indexOf(arg);
+        }
+        function unused(arg) {
+            return problem(arg);
+        }
+        function a(arg) {
+            return problem(arg);
+        }
+        function b(problem) {
+            return g[problem];
+        }
+        function c(arg) {
+            return b(a(arg));
+        }
+        console.log(c("PASS"));
+    }
+    expect: {
+        var g = [ "PASS" ];
+        function problem(arg) {
+            return g.indexOf(arg);
+        }
+        console.log(function(problem) {
+            return g[problem];
+        }(function(arg) {
+            return problem(arg);
+        }("PASS")));
+    }
+    expect_stdout: "PASS"
+}
+
+pr_3595_3: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var g = [ "PASS" ];
+        function problem(arg) {
+            return g.indexOf(arg);
+        }
+        function unused(arg) {
+            return problem(arg);
+        }
+        function a(arg) {
+            return problem(arg);
+        }
+        function b(problem) {
+            return g[problem];
+        }
+        function c(arg) {
+            return b(a(arg));
+        }
+        console.log(c("PASS"));
+    }
+    expect: {
+        var g = [ "PASS" ];
+        console.log(function(problem) {
+            return g[problem];
+        }(function(arg) {
+            return g.indexOf(arg);
+        }("PASS")));
+    }
+    expect_stdout: "PASS"
+}
+
+pr_3595_4: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        passes: 3,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var g = [ "PASS" ];
+        function problem(arg) {
+            return g.indexOf(arg);
+        }
+        function unused(arg) {
+            return problem(arg);
+        }
+        function a(arg) {
+            return problem(arg);
+        }
+        function b(problem) {
+            return g[problem];
+        }
+        function c(arg) {
+            return b(a(arg));
+        }
+        console.log(c("PASS"));
+    }
+    expect: {
+        var g = [ "PASS" ];
+        console.log((problem = g.indexOf("PASS"), g[problem]));
+        var problem;
+    }
+    expect_stdout: "PASS"
+}