replacing old 'firefox-56.0.2'
installing 'firefox-56.0.2'
building path(s) ‘/nix/store/75vcbbkd7b24wizma971dl09k3zvydc1-user-environment’
error: unexpected EOF reading a line
builder for ‘/nix/store/q664p5v4qxixjwviic6hfykxw89ydsq0-user-environment.drv’ failed with exit code 1
error: build of ‘/nix/store/q664p5v4qxixjwviic6hfykxw89ydsq0-user-environment.drv’ failed