fetchTree: add pos to EvalState::forceValue #5396
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- This way we improve error messages
on infinite recursion
- Demo:
```nix
let x = builtins.fetchTree x;
in x
```
- Before:
```bash
$ nix-instantiate --extra-experimental-features flakes --strict
error: infinite recursion encountered
```
- After:
```bash
$ nix-instantiate --extra-experimental-features flakes --strict
error: infinite recursion encountered
at /data/github/kamadorueda/nix/test.nix:1:9:
1| let x = builtins.fetchTree x;
| ^
2| in x
```
Mentions: NixOS#3505
- This way we improve error messages
on infinite recursion
- Demo:
```nix
let x = builtins.fetchTree {
type = "git";
inherit x;
};
in x
```
- Before:
```bash
$ nix-instantiate --extra-experimental-features flakes --strict
error: infinite recursion encountered
```
- After:
```bash
$ nix-instantiate --extra-experimental-features flakes --strict
error: infinite recursion encountered
at /data/github/kamadorueda/nix/test.nix:3:10:
2| type = "git";
3| inherit x;
| ^
4| };
```
Mentions: NixOS#3505
|
cc @bburdette |
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$ nix-instantiate --extra-experimental-features flakes --strict error: infinite recursion encountered at /data/github/kamadorueda/nix/test.nix:1:9: 1| let x = builtins.fetchTree x; | ^ 2| in x$ nix-instantiate --extra-experimental-features flakes --strict error: infinite recursion encountered at /data/github/kamadorueda/nix/test.nix:3:10: 2| type = "git"; 3| inherit x; | ^ 4| };Mentions: #3505