Editorial: Declare the target-alias in the preamble

... rather than the algorithm, for internal methods of an arguments exotic object.

(See issue tc39#1981)

spec.html

@@ -8939,9 +8939,8 @@ <h1>Arguments Exotic Objects</h1>
 
       <emu-clause id="sec-arguments-exotic-objects-getownproperty-p">
         <h1>[[GetOwnProperty]] ( _P_ )</h1>
-        <p>The [[GetOwnProperty]] internal method of an arguments exotic object when called with a property key _P_ performs the following steps:</p>
+        <p>The [[GetOwnProperty]] internal method of an arguments exotic object _args_ when called with a property key _P_ performs the following steps:</p>
         <emu-alg>
-          1. Let _args_ be the arguments object.
           1. Let _desc_ be OrdinaryGetOwnProperty(_args_, _P_).
           1. If _desc_ is *undefined*, return _desc_.
           1. Let _map_ be _args_.[[ParameterMap]].
@@ -8954,9 +8953,8 @@ <h1>[[GetOwnProperty]] ( _P_ )</h1>
 
       <emu-clause id="sec-arguments-exotic-objects-defineownproperty-p-desc">
         <h1>[[DefineOwnProperty]] ( _P_, _Desc_ )</h1>
-        <p>The [[DefineOwnProperty]] internal method of an arguments exotic object when called with a property key _P_ and Property Descriptor _Desc_ performs the following steps:</p>
+        <p>The [[DefineOwnProperty]] internal method of an arguments exotic object _args_ when called with a property key _P_ and Property Descriptor _Desc_ performs the following steps:</p>
         <emu-alg>
-          1. Let _args_ be the arguments object.
           1. Let _map_ be _args_.[[ParameterMap]].
           1. Let _isMapped_ be HasOwnProperty(_map_, _P_).
           1. Let _newArgDesc_ be _Desc_.
@@ -8981,9 +8979,8 @@ <h1>[[DefineOwnProperty]] ( _P_, _Desc_ )</h1>
 
       <emu-clause id="sec-arguments-exotic-objects-get-p-receiver">
         <h1>[[Get]] ( _P_, _Receiver_ )</h1>
-        <p>The [[Get]] internal method of an arguments exotic object when called with a property key _P_ and ECMAScript language value _Receiver_ performs the following steps:</p>
+        <p>The [[Get]] internal method of an arguments exotic object _args_ when called with a property key _P_ and ECMAScript language value _Receiver_ performs the following steps:</p>
         <emu-alg>
-          1. Let _args_ be the arguments object.
           1. Let _map_ be _args_.[[ParameterMap]].
           1. Let _isMapped_ be ! HasOwnProperty(_map_, _P_).
           1. If _isMapped_ is *false*, then
@@ -8996,9 +8993,8 @@ <h1>[[Get]] ( _P_, _Receiver_ )</h1>
 
       <emu-clause id="sec-arguments-exotic-objects-set-p-v-receiver">
         <h1>[[Set]] ( _P_, _V_, _Receiver_ )</h1>
-        <p>The [[Set]] internal method of an arguments exotic object when called with property key _P_, value _V_, and ECMAScript language value _Receiver_ performs the following steps:</p>
+        <p>The [[Set]] internal method of an arguments exotic object _args_ when called with property key _P_, value _V_, and ECMAScript language value _Receiver_ performs the following steps:</p>
         <emu-alg>
-          1. Let _args_ be the arguments object.
           1. If SameValue(_args_, _Receiver_) is *false*, then
             1. Let _isMapped_ be *false*.
           1. Else,
@@ -9013,9 +9009,8 @@ <h1>[[Set]] ( _P_, _V_, _Receiver_ )</h1>
 
       <emu-clause id="sec-arguments-exotic-objects-delete-p">
         <h1>[[Delete]] ( _P_ )</h1>
-        <p>The [[Delete]] internal method of an arguments exotic object when called with a property key _P_ performs the following steps:</p>
+        <p>The [[Delete]] internal method of an arguments exotic object _args_ when called with a property key _P_ performs the following steps:</p>
         <emu-alg>
-          1. Let _args_ be the arguments object.
           1. Let _map_ be _args_.[[ParameterMap]].
           1. Let _isMapped_ be ! HasOwnProperty(_map_, _P_).
           1. Let _result_ be ? OrdinaryDelete(_args_, _P_).