Function created in deconstruction in catch clause cannot access other vars from catch clause

[overlookmotel]

Input:

let fn;
try {
  throw new Error('foo');
} catch ( { message, x = (0, () => message) } ) {
  fn = x;
}
export default fn;

Output:

export default () => message;

message has not been recognised as a var in scope of the function.

Appears to be in part due to a bug in Babel. identifierPath.scope.getBinding('message') returns undefined.

[overlookmotel]

Babel issue: babel/babel#14024

[overlookmotel]

I think fixed in b2a0a09. Needs tests.