nix-shell segfaults when reading an empty file

[plha-demant]

Describe the bug

nix-shell segfaults when given an empty file as single argument.

Steps To Reproduce

1. Create an empty file. E.g. default.nix rm -f default.nix && touch default.nix

2. Run:

   nix-shell default.nix
   Segmentation fault

   Expected behavior I was expecting an error message like when you run nix-shell without any arguments:

   nix-shell 
   error: syntax error, unexpected end of file
   
      at /home/johndoe/default.nix:1:1:
   
           1|
            | ^

nix-env --version output Observed in the following versions:

nix (Nix) 2.13.3
nix (Nix) 2.15.1
nix (Nix) 2.16.0
nix (Nix) 2.17.0

**Additional context**

**Priorities**

[txtor]

it works for me on nix 2.16.1 [francesc@ew15 ~]$ rm -f default.nix && touch default.nix [francesc@ew15 ~]$ nix-shell default.nix error: syntax error, unexpected end of file

   at /home/francesc/default.nix:1:1:

        1|
         | ^

1 [francesc@ew15 ~]$ nix --version nix (Nix) 2.16.1

[mikyll]

Getting the same issue.

• System: NixOS on WSL
• Nix version: 2.18.4