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51 lines
1.2 KiB
Markdown
51 lines
1.2 KiB
Markdown
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---
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synopsis: Functions are printed with more detail
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prs: 9606
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issues: 7145
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---
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Functions and `builtins` are printed with more detail in `nix repl`, `nix
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eval`, `builtins.trace`, and most other places values are printed.
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Before:
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```
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$ nix repl nixpkgs
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nix-repl> builtins.map
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«primop»
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nix-repl> builtins.map lib.id
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«primop-app»
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nix-repl> builtins.trace lib.id "my-value"
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trace: <LAMBDA>
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"my-value"
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$ nix eval --file functions.nix
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{ id = <LAMBDA>; primop = <PRIMOP>; primop-app = <PRIMOP-APP>; }
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```
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After:
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```
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$ nix repl nixpkgs
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nix-repl> builtins.map
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«primop map»
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nix-repl> builtins.map lib.id
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«partially applied primop map»
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nix-repl> builtins.trace lib.id "my-value"
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trace: «lambda id @ /nix/store/8rrzq23h2zq7sv5l2vhw44kls5w0f654-source/lib/trivial.nix:26:5»
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"my-value"
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$ nix eval --file functions.nix
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{ id = «lambda id @ /Users/wiggles/nix/functions.nix:2:8»; primop = «primop map»; primop-app = «partially applied primop map»; }
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```
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This was actually released in Nix 2.20, but wasn't added to the release notes
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so we're announcing it here. The historical release notes have been updated as well.
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[type-error]: https://github.com/NixOS/nix/pull/9753
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[coercion-error]: https://github.com/NixOS/nix/pull/9754
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