Morrow

Sequencing of events?

1

This is more of a question than an issue, but is there a way to figure out which event occurred first between two events? My use-case is that I have...

 Perhaps something like "Help us improve error messages in Haskell tooling!"

Selecting a nonexistent field using record dot yields error about missing HasField instance

4

Using GHC 9.4.4: ``` λ> :set -XOverloadedRecordDot λ> data Person = Person { name :: String, age :: Int } deriving (Eq, Show, Ord) λ> john = Person "John" 34...

`TypeApplications` not suggested when used with function arrow `->`

1

``` GHCi, version 8.10.7: https://www.haskell.org/ghc/ :? for help Prelude> :t fmap @(Either _) :1:1: error: Pattern syntax in expression context: fmap@(Either _) Did you mean to enable TypeApplications? Prelude> :t...

`Parse error in pattern` for operator-style data constructors is vague

2

Consider the following GHCi session: ``` ghci> f x:xs = print(x, xs) :162:1: error: Parse error in pattern: f ``` This is a function that a beginner I was talking...

Scoped type variables not suggested

4

Consider the following file: ```hs module ErrMsg where f :: a -> a f x = y where y :: a y = x ``` When loaded up in GHCi...

Bare top-level expressions

4

Given this module: ```hs sum [1,2,3,4] ``` We get this error when loading it into GHCi: ``` Main.hs:1:1: error: Parse error: module header, import declaration or top-level declaration expected. |...

Incorrect usage of the term "bang-pattern"

11

Given the following module: ```hs module Bang where z = let !(x,y) = (1,2) in x ``` We get the following error message: ``` Bang.hs:3:9: error: Illegal bang-pattern (use BangPatterns):...

Relevant file: https://github.com/simmsb/calamity/blob/master/calamity/Calamity/HTTP/Webhook.hs#L36 This code snippet ```hs invoke $ CreateWebhook ctx' $ CreateWebhookData { username = Just "test-webhook", avatar = Just "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA ... } ``` yield an error ``` "Left...