ca0bd84589
This was put together by digging through the C++ Nix git history as described in the second paragraph. Note that this is only based on changes given when the language version was actually increased. There is no guarantee that there have been no other changes inbetween that would have warranted an increase as well. Change-Id: I4ddee0d4ecafa1b3e5e1a867e9700d6c32e936ad Reviewed-on: https://cl.tvl.fyi/c/depot/+/7836 Tested-by: BuildkiteCI Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su>
2.6 KiB
Nix language version history
The Nix language (“Nix”) has its own versioning mechanism independent from its
most popular implementation (“C++ Nix”): builtins.langVersion. It has been
increased whenever the language has changed syntactically or semantically in a
way that would not be introspectable otherwise. In particular, this does not
include addition (or removal) of builtins, as this can be introspected using
standard attribute set operations.
Changes to builtins.langVersion are best found by viewing the git history of
C++ Nix using git log -G 'mkInt\\(v, [0-9]\\)' for builtins.langVersion < 7.
After that point git log -G 'v\\.mkInt\\([0-9]+\\)' should work. To reduce the
amount of false positives, specify the version number you are interested in
explicitly.
1
The first version of the Nix language is its state at the point when
builtins.langVersion was added in 8b8ee53 which was first released
as part of C++ Nix 1.2.
2
Nix version 2 changed the behavior of builtins.storePath: It would now try to
substitute the given path if missing, instead of creating
an evaluation failure. builtins.langVersion was increased in e36229d.
3
Nix version 3 changed the behavior of the == behavior. Strings would now be
considered equal even if they had differing string context.
4
Nix version 4 added the float type to the language.
5
The increase of builtins.langVersion to 5 did not signify a
language change, but added support for structured attributes to the Nix daemon.
Eelco Dolstra writes as to what changed:
The structured attributes support. Unfortunately that's not so much a language change as a build.cc (i.e. daemon) change, but we don't really have a way to express that...
Probably builtins.nixVersion (which was added in version 1) should have been
used instead.
6
Nix version 6 added support for comparing two lists.