Input Code

export async function foo() {}
export default async function bar() {}

see https://astexplorer.net/#/QbgcqufEk7

The second line should be parsed as an ExportDefaultDeclaration and a FunctionDeclaration, but it is a FunctionExpression.

A named export with a function declaration leads to FunctionDeclaration whenever it's regular, async or generator function, a default export leads to FunctionDeclaration when regular or generator, but to FunctionExpression when async.

copied from babel/babylon#257
fixed in babylon with babel/babylon#324