Cannot build set of derivations when the keys starts by a digit

[RaitoBezarius]

Describe the bug

Instantiating the set of derivations when the keys contain an underscore is aborted and no paths are provided.

Steps To Reproduce

1. nix-instantiate -E 'with import <nixpkgs> {}; { "3" = fish; "2" = bash; }' does nothing
2. nix-instantiate -E 'with import <nixpkgs> {}; { a = fish; b = bash; }' returns the paths

Expected behavior

Expect result should be the one of the second step.

nix-env --version output

nix-env (Nix) 2.4pre20210802_47e96bb

[stale]

I marked this as stale due to inactivity. → More info

[RaitoBezarius]

Still a bug for me.

[lf-]

reproduces:

nix-instantiate --version
nix-instantiate (Nix) 2.18.1

[Lunaphied]

reproduces:

nix-instantiate --version
nix-instantiate (Nix) 2.19.2

[Lunaphied]

For additional context:

nix eval --expr 'with import <nixpkgs> {}; { "3" = fish; "2" = bash; }' --impure results in seemingly evaluating all of Nixpkgs and naturally hits a segfault before completing, (this also happens with the a, b version).

In nix repl both versions work correctly.

[thufschmitt]

nix eval --expr 'with import <nixpkgs> {}; { "3" = fish; "2" = bash; }' --impure results in seemingly evaluating all of Nixpkgs and naturally hits a segfault before completing, (this also happens with the a, b version).

Yes, that one is normal(ish). nix eval will try to deeply evaluate the derivations (and not just print their output/drv path like nix-instantiate or nix repl do, and that doesn't work because Nixpkgs is too scary for Nix. You can pass --json to work around it

[thufschmitt]

Culprit: https://github.com/nixos/nix/blob/3740cdb654f3320c34954bf13d915708fed09553/src/libexpr/get-drvs.cc#L373 introduced in b0cb117 .