David Fox

Would like to see a simple example - e.g. an implementation of unix diff(1)

2

Does anyone have a pointer to such an example?

Example in Data.Derive.UniplateDirect fails

8

{-# OPTIONS_GHC -F -pgmFderive -optF-F -optF-F #-} {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE MultiParamTypeClasses #-} import Data.Derive.UniplateDirect import Data.Generics.Uniplate.Direct data Foo a = Foo a (Bool, a) {-! deriving instance...

Feature request - precision control on time diff formatting

1

I'd like to be able to increase the time precision, so we would see things like "36 hours", "90 minutes", etc.

Fix linebreak (\\) command formatting.

3

The syntax of the \\ command, according to http://ftp.math.purdue.edu/mirrors/ctan.org/info/latex2e-help-texinfo/latex2e.html#g_t_005c_005c is either \\[measure] or \\*[measure].

GHC linker error - undefined symbol: mblock_address_space

5

I haven't investigated this closely, but when I try to compile with packman I get this: -- : error: -- : can't load .so/.DLL for: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.4.3/libHSpackman-0.5.0-Fv7reuyLHo03M7x4FerNmn-ghc8.4.3.so (/usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.4.3/libHSpackman-0.5.0-Fv7reuyLHo03M7x4FerNmn-ghc8.4.3.so: undefined symbol: mblock_address_space)...

Need some guidance / documentation

2

I'm sorry to say I'm a bit mystified by the API. I would like to use this to build sets of error types. Suppose I had a value of type...

Puzzling error message: No instance for ?Generic s?

1

I sometimes get error messages that resemble GHC missing instance messages but I don't understand what they actually mean. For example, the declaration ``` import Control.Lens (ReifiedLens(Lens)) foo :: HasPosition...

It currently always returns a Prism, couldn't it return an Iso based on the argument type? I'm not smart enough to have thought of this first - what am I...

Add HasCallStack constraints to the open and close functions

1

...so that error calls return a stack trace.