Deprecate old event types

[TeofilC]

We remove the parsing code for some old event types. We export some pattern synonyms for backwards compatibility. These will never successfully be matched against but it mean that end users wont have to update their code.

@wenkokke does this look OK in terms of minimizing breakage?

[TeofilC]

Hmm looks like the pattern synonyms trick only works for recent GHCs :(

[wenkokke]

Hmm looks like the pattern synonyms trick only works for recent GHCs :(

Is it just that DuplicateRecordFields isn't supported on those older versions or misbehaves when it comes to pattern synonyms?

[TeofilC]

Is it just that DuplicateRecordFields isn't supported on those older versions or misbehaves when it comes to pattern synonyms?

It's older versions not supporting DuplicateRecordFields. I need that since otherwise I get errors because some of the pattern synonyms declare the same field names.

Dropping support for older versions soon wouldn't be too bad though. I doubt anyone actually uses new versions of this library with old versions of GHC.