Hi. I recently found strange behaviour
% nix repl
Welcome to Nix version 2.1.3. Type :? for help.nix-repl> a = import {}
nix-repl> b = import {}
nix-repl> a == b
false
but if
% nix repl
Welcome to Nix version 2.1.3. Type :? for help.nix-repl> a = import {}
nix-repl> b = a
nix-repl> a == b
error: assertion failed at /nix/store/zkqn8mj44lp5ii8ck2jxp137y9w6d1g1-nixos-19.03pre159472.80738ed9dc0/nixos/pkgs/top-level/all-packages.nix:9202:12
this behavior is counter intuitive, can anyone explain what is going on here? The second one looks understandable, but why the first one returns just false and not trying to evaluate tree? As I understand first and second case must behave just identical.