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manual: Update Attribute Set section to exclude indented strings and URIs

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Indented strings and URIs are string literals but they are not allowed
as names for attrsets, `let` or `inherit`. The following snippets
illustrate that they lead to syntax errors.

==> examples/ind_str-attr.nix <==
{
  ''indented string'' = "error: syntax error, expecting '}'";
}

==> examples/ind_str-inherit.nix <==
{ inherit ({ "non-indented string" = "error: syntax error, expecting ';'"; })
    ''non-indented string'';
}

==> examples/ind_str-let.nix <==
let
  ''indented string'' = "error: syntax error, expecting 'in'";
in
  true

==> examples/uri-attr.nix <==
{
  http://example.org/foo.tar.bz2 = "error: syntax error, expecting '}'";
}

==> examples/uri-inherit.nix <==
{ inherit ({ "http://example.org/foo.tar.bz2" = "error: syntax error, expecting ';'"; })
    http://example.org/foo.tar.bz2;
}

==> examples/uri-let.nix <==
let
  http://example.org/foo.tar.bz2 = "error: syntax error, expecting 'in'";
in
  true

Change-Id: I6774af93baf9f533877642a563775667c518ea88
This commit is contained in:
toonn
2026-06-06 14:52:54 +00:00
parent d5cf115a3c
commit 2698fe8611
1 changed files with 1 additions and 1 deletions
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doc/manual/src/language/values.md
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@@ -164,7 +164,7 @@ Note that lists are only lazy in values, and they are strict in length.
An attribute set is a collection of name-value-pairs (called *attributes*) enclosed in curly brackets (`{ }`).
An attribute name can be an identifier or a [string](#type-string).
An attribute name can be an identifier or a [double-quoted string](#type-string).
An identifier must start with a letter (`a-z`, `A-Z`) or underscore (`_`), and can otherwise contain letters (`a-z`, `A-Z`), numbers (`0-9`), underscores (`_`), apostrophes (`'`), or dashes (`-`).
> *name* = *identifier* | *string* \