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Add inlay hints documentation

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Kirill Bulatov 2020-02-22 10:23:03 +03:00
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docs/user/features.md
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@ -156,3 +156,28 @@ default highlighter.
Experimental feature that, given code highlighting using rust-analyzer is Experimental feature that, given code highlighting using rust-analyzer is
active, will pick unique colors for identifiers. active, will pick unique colors for identifiers.
### Code hints
Rust Analyzer has two types of hints to show the information about the code:
* hover hints, appearing on hover on any element.
Contains extended information on the language item hovered.
* inlay hints, shown near the element hinted directly in the editor.
Two types of inlay hints are displayed currently:
* type hints, displaying the minimal information on the type of the expression (if the information is available)
* parameter name hints, displaying the names of the parameters in the corresponding methods
#### VS Code
In VS Code, the following settings can be used to configure the inlay hints:
* rust-analyzer.displayInlayHints — toggles inlay hints display on or off
* rust-analyzer.maxInlayHintLength — shortens the hints if their length exceed the value specified. If no value is specified (`null`), no shorteninng is applied.
**Note:** VS Code does not have a native support for inlay hints [yet](https://github.com/microsoft/vscode/issues/16221) and the hints are implemented using decorations.
This approach has limitations: the caret movement near the end of the hint may look [weird](https://github.com/rust-analyzer/rust-analyzer/issues/1623).