Simon Marlow

Software Engineer at Facebook, Haskell enthusiast, GHC boiler-room technician

[Simon Marlow @simonmar]

@dsp_ @donsbot Yes :( The latest problem is with some upstream changes to fbthrift

[Serokell @serokell]

Did you know that Haskell is used in production at Meta? 🤯

In our latest article, we talk with Simon Marlow from Meta about their Haskell projects – Glean and Haxl – and his thoughts about Haskell in the industry.

Read on our blog:
https://t.co/F8X813l3td

[Simon Marlow @simonmar]

@ezyang @dogfishbar Feel free to invite me to meetings to help you justify Haskell!

[Simon Marlow @simonmar]

@kmett Clearly nobody wants to work with me

[Simon Marlow @simonmar]

@GabriellaG439 https://t.co/8B2JK2kPam

[Simon Marlow @simonmar]

@GabriellaG439 FWIW Glean's typechecker doesn't have unification variables. Mainly because I was feeling lazy and wanted to see how well it worked. The answer has been well enough, so far - people find it a bit odd sometimes though. This is a logic language not a functional one.

[Catherine Stenson @CatherineStenso]

Calling all #functionalprogrammers especially those based in Australia or nearby timezones! This is a top event with great speakers @deanwampler @simonmar & @kmett #Scala #Erlang #Haskell

[Simon Marlow @simonmar]

@OomReni You'll be happy to know I regularly fail at any number of simple things and am constantly exasperated :)

[Simon Marlow @simonmar]

@EyalL @deguerre @jkachmar @christopherdone @artiegold Correct, it was a joke primarily. People were having a lot of fun designing a language without the constraints of actual users (well, not many of them at least), and they knew that success would bring an end to all that. So, we must avoid success!

[Simon Marlow @simonmar]

@tscholak @moleike @IborraPepe Also - did you actually get Python support for fbthrift working? We need that in order to open-source our Python indexer for Glean.

[Simon Marlow @simonmar]

@tscholak @moleike @IborraPepe Curious what kind of latency problems you've had? Latency has been pretty good for our services built on this.

[Don Syme @dsymetweets]

A farewell to Simon Peyton Jones as he leaves Microsoft Research

Subject: RE: New horizon

I would like to add a few words to what Chris has written.  I know I am also speaking for Mads, the current lead designer of C# (cc’d)

[Simon Marlow @simonmar]

@benignbala Fixed

[Simon Marlow @simonmar]

I'm delighted that we're finally able to open source Glean, the system we're building at Facebook for collecting and querying information about code:

https://t.co/xhrwWEFmrT

[1/8]

[Simon Marlow @simonmar]

@lldong Stacked DBs are fully supported, but you can currently only *add* to the facts in the base DB, not delete or replace. That's the bit we're working on.

[Simon Marlow @simonmar]

@lldong We're working on incremental indexing but it's not ready yet. The idea is that you'll be able to index a set of changes relative to a base DB, and treat the whole as if it were a single DB. Build up stacks of increments.

[Simon Marlow @simonmar]

@benignbala Yeah, I need to fix that but CSS is a bit beyond my powers. The CSS is in the repo and it's open source you know 😉

[Simon Marlow @simonmar]

@the_siamak Yes we do! But plans only, nothing exists yet.

[Simon Marlow @simonmar]

@sunstonenebula @twitchard It can be used to store and query code coverage data (or in general any data you want to associate with code)

[Simon Marlow @simonmar]

@uhbif19 @twitchard Glean doesn't currently do recursive queries, so that's probably the biggest difference right now.