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Merge #5407

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5407: Mentioned problem matchers and running cargo-watch as a VS Code Task r=matklad a=Michael-F-Bryan

See https://github.com/rust-analyzer/rust-analyzer/issues/3596#issuecomment-658887055.

Co-authored-by: Michael-F-Bryan <michaelfbryan@gmail.com>
Co-authored-by: Michael Bryan <Michael-F-Bryan@users.noreply.github.com>
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@ -373,3 +373,22 @@ Or it is possible to specify vars more granularly:
```
You can use any valid RegExp as a mask. Also note that a full runnable name is something like *run bin_or_example_name*, *test some::mod::test_name* or *test-mod some::mod*, so it is possible to distinguish binaries, single tests, and test modules with this masks: `"^run"`, `"^test "` (the trailing space matters!), and `"^test-mod"` respectively.
==== Compiler feedback from external commands
Instead of relying on the built-in `cargo check`, you can configure Code to run a command in the background and use the `$rustc-watch` problem matcher to generate inline error markers from its output.
To do this you need to create a new https://code.visualstudio.com/docs/editor/tasks[VS Code Task] and set `rust-analyzer.checkOnSave.enable: false` in preferences.
For example, if you want to run https://crates.io/crates/cargo-watch[`cargo watch`] instead, you might add the following to `.vscode/tasks.json`:
```json
{
"label": "Watch",
"group": "build",
"type": "shell",
"command": "cargo watch",
"problemMatcher": "$rustc-watch",
"isBackground": true
}
```