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blog(nix-iceberg): explain <nix/*>

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site/blog/2024-04-15-nix-iceberg.md
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@ -950,17 +950,54 @@ Let's see if that is true:
```nix
nix-repl> builtins.readDir <nix>
{
".clang-format" = "regular";
".clang-tidy" = "regular";
".dir-locals.el" = "regular";
".editorconfig" = "regular";
".github" = "directory";
".gitignore" = "regular";
".mergify.yml" = "regular";
".shellcheckrc" = "regular";
".version" = "regular";
".version-determinate" = "regular";
"CITATION.cff" = "regular";
"CONTRIBUTING.md" = "regular";
COPYING = "regular";
"HACKING.md" = "symlink";
"README.md" = "regular";
contrib = "directory";
doc = "directory";
"docker.nix" = "regular";
"flake.lock" = "regular";
"flake.nix" = "regular";
maintainers = "directory";
"meson.build" = "regular";
"meson.options" = "regular";
misc = "directory";
nix-meson-build-support = "directory";
packaging = "directory";
"precompiled-headers.h" = "regular";
scripts = "directory";
src = "directory";
tests = "directory";
}
```
<!-- TODO: Say: There doesn't seem to be a `fetchurl.nix` file here. After it doesn't exist. -->
There doesn't seem to be a `fetchurl.nix` file here.
This is because `<nix>` is actually `corepkgs`, which is a Nix path
This is because
[`<nix/*>` actually falls back to `corepkgs`](https://github.com/NixOS/nix/blob/2afc84fddf463b22196aeb70587bc0c9259e330f/src/libexpr/eval.cc#L3117-L3118),
which is a Nix path
[defined inside Nix itself.](https://github.com/NixOS/nix/blob/2afc84fddf463b22196aeb70587bc0c9259e330f/src/libexpr/eval.cc#L321)
[Later, the `fetchurl.nix` path is defined in `corepkgs`](https://github.com/NixOS/nix/blob/2afc84fddf463b22196aeb70587bc0c9259e330f/src/libexpr/eval.cc#L363)
and its contents are set to a
[generated C++ header.](https://github.com/NixOS/nix/blob/2afc84fddf463b22196aeb70587bc0c9259e330f/src/libexpr/meson.build#L129-L135)
You do not need to be in impure evaluation mode to use `corepkgs`, aka
`<nix/*>`.
### test suite of nix wasn't run
TODO