[vaibhavsagar@nixos:~/code/notebooks/smt]$ nix-build --show-trace
error: while evaluating the file '/home/vaibhavsagar/code/notebooks/pkgs.nix':
while evaluating anonymous function at /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/top-level/impure.nix:15:1, called from /home/vaibhavsagar/code/notebooks/pkgs.nix:2:12:
while evaluating anonymous function at /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/top-level/default.nix:20:1, called from /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/top-level/impure.nix:82:1:
while evaluating anonymous function at /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/stdenv/booter.nix:42:1, called from /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/top-level/default.nix:108:10:
while evaluating 'dfold' at /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/stdenv/booter.nix:60:27, called from /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/stdenv/booter.nix:117:4:
while evaluating 'go' at /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/stdenv/booter.nix:63:18, called from /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/stdenv/booter.nix:72:13:
while evaluating 'folder' at /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/stdenv/booter.nix:89:33, called from /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/stdenv/booter.nix:68:18:
while evaluating 'allPackages' at /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/top-level/default.nix:98:17, called from /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/stdenv/booter.nix:101:10:
while evaluating anonymous function at /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/top-level/stage.nix:12:1, called from /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/top-level/default.nix:98:26:
while evaluating 'fix' at /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/lib/fixed-points.nix:19:9, called from /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/top-level/stage.nix:221:3:
while evaluating 'overlays' at /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/top-level/impure.nix:47:18, called from /nix/store/a7ykxcacd4gs34v1jcx9j97rd591671h-nixos-19.03.173068.9ec7625cee5/nixos/pkgs/top-level/impure.nix:68:14:
syntax error, unexpected $end, expecting ':' or '@', at /home/vaibhavsagar/.config/nixpkgs/overlays.nix:1:4