T2965: Patterns as rest parameter operands are not valid, therefore this relic should go

packages/babel-plugin-transform-es2015-parameters/src/rest.js

@@ -105,7 +105,6 @@ export let visitor = {
     // otherwise `arguments` will be remapped in arrow functions
     argsId._shadowedFunctionLiteral = path;
 
-
     function optimiseCandidate(parent, parentPath, offset) {
       if (t.isReturnStatement(parentPath.parent) || t.isIdentifier(parentPath.parent.id)) {
         parentPath.replaceWith(loadRest({
@@ -127,18 +126,6 @@ export let visitor = {
       }
     }
 
-    // support patterns // no test case?
-    if (t.isPattern(rest)) {
-      let pattern = rest;
-      rest = scope.generateUidIdentifier("ref");
-
-      let declar = t.variableDeclaration("let", pattern.elements.map(function (elem, index) {
-        let accessExpr = t.memberExpression(rest, t.numericLiteral(index), true);
-        return t.variableDeclarator(elem, accessExpr);
-      }));
-      node.body.body.unshift(declar);
-    }
-
     // check and optimise for extremely common cases
     let state = {
       references: [],
@@ -175,8 +162,6 @@ export let visitor = {
     // deopt shadowed functions as transforms like regenerator may try touch the allocation loop
     state.deopted = state.deopted || !!node.shadow;
 
-    //
-
     let start = t.numericLiteral(node.params.length);
     let key = scope.generateUidIdentifier("key");
     let len = scope.generateUidIdentifier("len");