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queries: Improve Rust const generic and '_' type highlighting

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You may pass constants as type arguments the const generics feature.
This is used in spellbook for example as a poor man's enum, for example
`self.strip_suffix_only::<FULL_WORD>(word, hidden_homonym)`. With this
change that `FULL_WORD` part is highlighted as a constant instead of
a type.

This change also highlight the underscore in type placeholders - this
is similar to the highlighting done for bindings in Elixir or Erlang
for example. In `Vec<_>` the underscore is highlighted the same as a
comment.
This commit is contained in:
Michael Davis 2025-02-02 19:24:13 -05:00
parent 5952d564d1
commit b8bfc44e42
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1 changed files with 4 additions and 2 deletions
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6
runtime/queries/rust/highlights.scm
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@ -95,8 +95,10 @@
left: (type_identifier) @type.parameter)
(optional_type_parameter
name: (type_identifier) @type.parameter)
(type_arguments
(type_identifier))
((type_arguments (type_identifier) @constant)
(#match? @constant "^[A-Z_]+$"))
((type_arguments (type_identifier) @comment.unused)
(#eq? @comment.unused "_"))
; ---
; Primitives