9a6890c92f
* Remove buildDefaultParamAssign This seems to have been [added](https://github.com/babel/babel/commit/4b85b05839017ab2abc03ba2d1 e875a63f002890) in v5.5.4 to address [#1690](https://phabricator.babeljs.io/T1690). It [became “dead”](https://github.com/babel/babel/blob/v6.0.0/packages/babel-core/t est/fixtures/transformation/es6.parameters/default-before-last/expected. js) (as far as I can tell) in the [v6.0.0 commit](https://github.com/babel/babel/commit/ae7d5367f1c3d438667242d692 5db024f875fccd). Either way, this code is never executed. - `pushDefNode` is only called when the param is a default param. - `buildDefaultParamAssign` (which is inside `pushDefNode`) only runs of the param index is less than or equals to the lastNonDefaultParam. AKA, is this param before any non-defaulting params. Which is a contradiction. * Small optimization No need to check if we need an iife if we already know we need one.