Warning: random.cabal:15:2: Tabs used as indentation at 15:2, 16:2, 17:2
Configuring random-1.1...
Preprocessing library for random-1.1..
Building library for random-1.1..
[1 of 1] Compiling System.Random    ( System/Random.hs, .stack-work/dist/x86_64-linux/Cabal-2.4.0.1/build/System/Random.o )

System/Random.hs:43:1: warning: [-Wtabs]
    Tab character found here, and in 74 further locations.
    Please use spaces instead.
   |
43 |         (
   | ^^^^^^^^
Installing library in /home/sv/.stack/snapshots/x86_64-linux/lts-13.22/8.6.5/lib/x86_64-linux-ghc-8.6.5/random-1.1-3ypV4EIycgb35PKjTYYr5q
Registering library for random-1.1..