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# Release 0.13 (2009-11-05)
This is primarily a bug fix release. It has some new features:
- Syntactic sugar for writing nested attribute sets. Instead of
{
foo = {
bar = 123;
xyzzy = true;
};
a = { b = { c = "d"; }; };
}
you can write
{
foo.bar = 123;
foo.xyzzy = true;
a.b.c = "d";
}
This is useful, for instance, in NixOS configuration files.
- Support for Nix channels generated by Hydra, the Nix-based
continuous build system. (Hydra generates NAR archives on the fly,
so the size and hash of these archives isn’t known in advance.)
- Support `i686-linux` builds directly on `x86_64-linux` Nix
installations. This is implemented using the `personality()`
syscall, which causes `uname` to return `i686` in child processes.
- Various improvements to the `chroot` support. Building in a `chroot`
works quite well now.
- Nix no longer blocks if it tries to build a path and another process
is already building the same path. Instead it tries to build another
buildable path first. This improves parallelism.
- Support for large (\> 4 GiB) files in NAR archives.
- Various (performance) improvements to the remote build mechanism.
- New primops: `builtins.addErrorContext` (to add a string to stack
traces — useful for debugging), `builtins.isBool`,
`builtins.isString`, `builtins.isInt`, `builtins.intersectAttrs`.
- OpenSolaris support (Sander van der Burg).
- Stack traces are no longer displayed unless the `--show-trace`
option is used.
- The scoping rules for `inherit
(e) ...` in recursive attribute sets have changed. The expression e
can now refer to the attributes defined in the containing set.
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