fix inline handling of AST_Call.args (#2059)

lib/compress.js

@@ -3183,19 +3183,21 @@ merge(Compressor.prototype, {
                 if (body) {
                     var fn = exp.clone();
                     fn.argnames = [];
-                    fn.body = [
+                    fn.body = [];
-                        make_node(AST_Var, self, {
+                    if (exp.argnames.length > 0) {
+                        fn.body.push(make_node(AST_Var, self, {
                             definitions: exp.argnames.map(function(sym, i) {
+                                var arg = self.args[i];
                                 return make_node(AST_VarDef, sym, {
                                     name: sym,
-                                    value: self.args[i] || make_node(AST_Undefined, self)
+                                    value: arg ? arg.clone(true) : make_node(AST_Undefined, self)
                                 });
                             })
-                        })
+                        }));
-                    ];
+                    }
                     if (self.args.length > exp.argnames.length) {
                         fn.body.push(make_node(AST_SimpleStatement, self, {
-                            body: make_sequence(self, self.args.slice(exp.argnames.length))
+                            body: make_sequence(self, self.args.slice(exp.argnames.length)).clone(true)
                         }));
                     }
                     fn.body.push(make_node(AST_Return, self, {

test/compress/issue-281.js

@@ -431,3 +431,53 @@ pure_annotation: {
     }
     expect_exact: ""
 }
+
+drop_fargs: {
+    options = {
+        cascade: true,
+        inline: true,
+        keep_fargs: false,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var a = 1;
+        !function(a_1) {
+            a++;
+        }(a++ + (a && a.var));
+        console.log(a);
+    }
+    expect: {
+        var a = 1;
+        !function() {
+            a++;
+        }(++a && a.var);
+        console.log(a);
+    }
+    expect_stdout: "3"
+}
+
+keep_fargs: {
+    options = {
+        cascade: true,
+        inline: true,
+        keep_fargs: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var a = 1;
+        !function(a_1) {
+            a++;
+        }(a++ + (a && a.var));
+        console.log(a);
+    }
+    expect: {
+        var a = 1;
+        !function(a_1) {
+            a++;
+        }(++a && a.var);
+        console.log(a);
+    }
+    expect_stdout: "3"
+}