How to Collect Type Errors?

[Guanda Yuan]

Hello all,

I want to write a plugin for Haskell Language Server, to collect type
errors in the code. I'm new to GHC API, so I need some help. My current
thought is, I can collect diagnostics or the error messages and extract the
type error infos. I have tried to referred to the Haddock documentation for
GHC API, but I'm still not sure which function should I use.

Thanks,
Guanda
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