6b470f71

By: Tom Sydney Kerckhove <syd@cs-syd.eu>

Show actual remaining elements in ListLit diff instead of placeholder

Replace the `[N elements]` placeholder replacement text with actual
element removal: dropHead removes the first element, dropLast removes
the last element, by splitting the source text at the last/first
top-level comma respectively.

Suite timing

Time to Start Worker time Duration Time to finish
Config 0s 5s 5s 5s
Eval 6s 2m18s 2m18s 2m25s
Build 1m10s 57m13s 15m28s 16m38s
Test - - - -
Deploy - - - -
Suite 0s 59m38s 16m38s 16m38s