Map.! error when having Array in message

[samuelpilz]

This adds another report for #1851. The message is an array. Below is a minimal code example

module Main exposing (main)

import Array exposing (Array)
import Browser
import Html


main : Program () Int (Array Int)
main =
    Browser.element
        { init = \_ -> ( 0, Cmd.none )
        , update = \_ m -> ( m, Cmd.none )
        , view = \_ -> Html.div [] []
        , subscriptions = \_ -> Sub.none
        }

$ elm --version
0.19.0
$ elm make Main.elm --debug
Success! Compiled 1 module.                                          
elm: Map.!: given key is not an element in the map
CallStack (from HasCallStack):
  error, called at ./Data/Map/Internal.hs:610:17 in containers-0.5.11.0-K2TDqgYtGUcKxAY1UqVZ3R:Data.Map.Internal
$ elm make Main.elm
Success! Compiled 1 module. 

The elm.json was not edited.

It is notable that Ellie app has trouble with this error: https://ellie-app.com/3ZNMV93LMjFa1. Compilation succeeds but a runtime error is thrown.

[samuelpilz]

Closing, in favor of #1864