NixOS/nix
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Nix, the purely functional package manager
13059 commits 184 branches 170 tags 103 MiB
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Shell 10.6%
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John Ericson 19c5394971 Change "while evaluating <fun>" to "while *calling*" in trace 
The old way was not correct.

Here is an example:
```
 $ nix-instantiate --eval --expr 'let x = a: throw "asdf"; in x 1' --show-trace
error: asdf

       … while evaluating 'x'

       at «string»:1:9:

            1| let x = a: throw "asdf"; in x 1
             |         ^

       … from call site

       at «string»:1:29:

            1| let x = a: throw "asdf"; in x 1
             |                             ^
```
and yet also:
```
 $ nix-instantiate --eval --expr 'let x = a: throw "asdf"; in x' --show-trace
<LAMBDA>
```

Here is the thing: in both cases we are evaluating `x`!

Nix is a higher-order languages, and functions are a sort of value. When
we write `x = a: ...`, `a: ...` is the expression that `x` is being
defined to be, and that is already a value. Therefore, we should *never*
get an trace that says "while evaluating `x`", because evaluating `a:
...` is *trival* and nothing happens during it!

What is actually happening here is we are applying `x` and evaluating
its *body* with arguments substituted for parameters. I think the
simplest way to say is just "while *calling* `x`", and so that is what I
changed it to.
2022-12-02 09:14:12 -05:00
.github Bump zeebe-io/backport-action from 0.0.8 to 0.0.9 2022-11-28 22:00:44 +00:00
config Run autoupdate 2021-06-01 11:42:38 +02:00
contrib function-trace: always show the trace 2019-09-18 23:23:21 +02:00
doc/manual Merge pull request #7251 from RelationalAI-oss/sp-docs-uninstall-prompt 2022-12-01 19:24:09 +01:00
m4 autoconf: Fix C++17 detection not working on Ubuntu 16.04. 2019-07-03 04:32:25 +02:00
maintainers Integrate push-docker.sh into the release script 2022-02-18 13:58:01 +01:00
misc Apply suggestions from code review 2022-09-02 10:50:02 -05:00
mk Fix incremental static builds 2022-06-22 17:53:58 +02:00
perl Remove std::string alias (for real this time) 2022-02-25 16:13:02 +01:00
scripts Add --yes option for Nix installation script 2022-10-25 16:43:00 -07:00
src Change "while evaluating <fun>" to "while *calling*" in trace 2022-12-02 09:14:12 -05:00
tests Really fix 'nix store make-content-addressed --json' 2022-12-01 16:29:09 +01:00
.dir-locals.el .dir-locals.el: Set c-block-comment-prefix 2020-07-10 11:21:06 +02:00
.editorconfig Add .editorconfig 2017-06-05 22:57:28 +01:00
.gitignore Add fish suport to installer 2022-09-13 12:56:16 -04:00
.version Bump version 2022-08-25 11:50:14 +02:00
boehmgc-coroutine-sp-fallback.diff Update boehmgc-coroutine-sp-fallback.diff for darwin 2022-09-01 11:48:50 -05:00
bootstrap.sh bootstrap: Simplify & make more robust. 2011-09-06 12:11:05 +00:00
configure.ac Don't use -load_all on darwin 2022-08-03 10:27:25 +02:00
COPYING * Change this to LGPL to keep the government happy. 2006-04-25 16:41:06 +00:00
default.nix Remove url literals 2022-01-24 13:28:21 +01:00
docker.nix Add nobody user/group to Nix docker image 2022-11-29 10:01:46 +00:00
flake.lock curl: patch for netrc regression in Nix 2022-07-14 17:45:02 -05:00
flake.nix Add tests for auto-uid-allocation, uid-range and cgroups 2022-11-27 16:38:34 +01:00
local.mk Remove 'dist' target 2020-12-03 16:17:58 +01:00
Makefile Merge branch 'master' into lto 2022-05-25 11:55:13 +00:00
Makefile.config.in Embed the sandbox shell into the statically linked 'nix' binary 2022-06-23 04:08:28 +02:00
precompiled-headers.h Config: Use nlohmann/json 2020-08-20 11:02:16 +02:00
README.md Fix link to hacking doc 2022-07-30 09:12:50 -07:00
shell.nix Remove url literals 2022-01-24 13:28:21 +01:00

README.md

Nix

Open Collective supporters Test

Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.

Installation

On Linux and macOS the easiest way to install Nix is to run the following shell command (as a user other than root):

$ curl -L https://nixos.org/nix/install | sh

Information on additional installation methods is available on the Nix download page.

Building And Developing

See our Hacking guide in our manual for instruction on how to build nix from source with nix-build or how to get a development environment.

Additional Resources

License

Nix is released under the LGPL v2.1.