Make `cargo run` always available for binaries

Previously, items for `cargo test` and `cargo check` would appear as in
the `Select Runnable` quick pick that appears when running
`rust-analyzer: Run`, but `run` would only appear as a runnable if a
`main`` function was selected in the editor. This change adds `cargo
run` as an always available runnable command for binary packages.

This makes it easier to develop cli / tui applications, as now users can
run application from anywhere in their codebase.

2 files changed, 171 insertions, 0 deletions

diff --git a/src/tools/rust-analyzer/xtask/test_data/expected.md b/src/tools/rust-analyzer/xtask/test_data/expected.md
new file mode 100644
index 00000000000..19c940c67bd
--- /dev/null
+++ b/src/tools/rust-analyzer/xtask/test_data/expected.md
@@ -0,0 +1,81 @@
+# Changelog #256
+
+Hello!
+
+Commit: [`0123456`](https://github.com/rust-analyzer/rust-analyzer/commit/0123456789abcdef0123456789abcdef01234567) \
+Release: [`2022-01-01`](https://github.com/rust-analyzer/rust-analyzer/releases/2022-01-01)
+
+## New Features
+
+- **BREAKING** [`#1111`](https://github.com/rust-analyzer/rust-analyzer/pull/1111) shortcut <kbd>ctrl</kbd>+<kbd>r</kbd>
+  - hyphen-prefixed list item
+- nested list item
+  - `foo` -> `foofoo`
+  - `bar` -> `barbar`
+- listing in the secondary level
+  1. install
+  1. add to config
+
+     ```json
+     {"foo":"bar"}
+     ```
+- list item with continuation
+
+  ![](https://example.com/animation.gif)
+
+  ![alt text](https://example.com/animation.gif)
+
+  <video src="https://example.com/movie.mp4" controls loop>Your browser does not support the video tag.</video>
+
+  <video src="https://example.com/movie.mp4" autoplay controls loop>Your browser does not support the video tag.</video>
+
+  _Image_\
+  ![](https://example.com/animation.gif)
+
+  _Video_\
+  <video src="https://example.com/movie.mp4" controls loop>Your browser does not support the video tag.</video>
+
+  ```bash
+  rustup update nightly
+  ```
+
+  ```
+  This is a plain listing.
+  ```
+- single line item followed by empty lines
+- multiline list
+  item followed by empty lines
+- multiline list
+  item with indent
+- multiline list
+  item not followed by empty lines
+- multiline list
+  item followed by different marker
+  - foo
+  - bar
+- multiline list
+  item followed by list continuation
+
+  paragraph
+  paragraph
+
+## Another Section
+
+- foo bar baz
+- list item with an inline image
+  ![](https://example.com/animation.gif)
+
+The highlight of the month is probably [`#1111`](https://github.com/rust-analyzer/rust-analyzer/pull/1111).
+See [online manual](https://example.com/manual) for more information.
+
+```bash
+rustup update nightly
+```
+
+```
+rustup update nightly
+```
+
+```
+This is a plain listing.
+```
diff --git a/src/tools/rust-analyzer/xtask/test_data/input.adoc b/src/tools/rust-analyzer/xtask/test_data/input.adoc
new file mode 100644
index 00000000000..105bd8df0db
--- /dev/null
+++ b/src/tools/rust-analyzer/xtask/test_data/input.adoc
@@ -0,0 +1,90 @@
+= Changelog #256
+:sectanchors:
+:page-layout: post
+
+Hello!
+
+Commit: commit:0123456789abcdef0123456789abcdef01234567[] +
+Release: release:2022-01-01[]
+
+== New Features
+
+* **BREAKING** pr:1111[] shortcut kbd:[ctrl+r]
+- hyphen-prefixed list item
+* nested list item
+** `foo` -> `foofoo`
+** `bar` -> `barbar`
+* listing in the secondary level
+. install
+. add to config
++
+[source,json]
+----
+{"foo":"bar"}
+----
+* list item with continuation
++
+image::https://example.com/animation.gif[]
++
+image::https://example.com/animation.gif["alt text"]
++
+video::https://example.com/movie.mp4[options=loop]
++
+video::https://example.com/movie.mp4[options="autoplay,loop"]
++
+.Image
+image::https://example.com/animation.gif[]
++
+.Video
+video::https://example.com/movie.mp4[options=loop]
++
+[source,bash]
+----
+rustup update nightly
+----
++
+----
+This is a plain listing.
+----
+* single line item followed by empty lines
+
+* multiline list
+item followed by empty lines
+
+* multiline list
+  item with indent
+
+* multiline list
+item not followed by empty lines
+* multiline list
+item followed by different marker
+** foo
+** bar
+* multiline list
+item followed by list continuation
++
+paragraph
+paragraph
+
+== Another Section
+
+* foo bar baz
+* list item with an inline image
+  image:https://example.com/animation.gif[]
+
+The highlight of the month is probably pr:1111[].
+See https://example.com/manual[online manual] for more information.
+
+[source,bash]
+----
+rustup update nightly
+----
+
+[source]
+----
+rustup update nightly
+----
+
+----
+This is a plain listing.
+----