Stabilize --crate-version option in rustdoc

Author: GuillaumeGomez

src/bootstrap/bin/rustdoc.rs

@@ -52,12 +52,7 @@ fn main() {
     // Bootstrap's Cargo-command builder sets this variable to the current Rust version; let's pick
     // it up so we can make rustdoc print this into the docs
     if let Some(version) = env::var_os("RUSTDOC_CRATE_VERSION") {
-        // This "unstable-options" can be removed when `--crate-version` is stabilized
-        if !has_unstable {
-            cmd.arg("-Z").arg("unstable-options");
-        }
         cmd.arg("--crate-version").arg(version);
-        has_unstable = true;
     }
 
     // Needed to be able to run all rustdoc tests.

src/doc/rustdoc/src/command-line-arguments.md

@@ -390,3 +390,15 @@ the same CSS rules as the official `light` theme.
 `--check-theme` is a separate mode in `rustdoc`. When `rustdoc` sees the
 `--check-theme` flag, it discards all other flags and only performs the CSS rule
 comparison operation.
+
+### `--crate-version`: control the crate version
+
+Using this flag looks like this:
+
+```bash
+$ rustdoc src/lib.rs --crate-version 1.3.37
+```
+
+When `rustdoc` receives this flag, it will print an extra "Version (version)" into the sidebar of
+the crate root's docs. You can use this flag to differentiate between different versions of your
+library's documentation.

src/doc/rustdoc/src/unstable-features.md

@@ -269,18 +269,6 @@ Markdown file, the URL given to `--markdown-playground-url` will take precedence
 `--playground-url` and `#![doc(html_playground_url = "url")]` are present when rendering crate docs,
 the attribute will take precedence.
 
-### `--crate-version`: control the crate version
-
-Using this flag looks like this:
-
-```bash
-$ rustdoc src/lib.rs -Z unstable-options --crate-version 1.3.37
-```
-
-When `rustdoc` receives this flag, it will print an extra "Version (version)" into the sidebar of
-the crate root's docs. You can use this flag to differentiate between different versions of your
-library's documentation.
-
 ### `--sort-modules-by-appearance`: control how items on module pages are sorted
 
 Using this flag looks like this:

src/librustdoc/lib.rs

@@ -266,7 +266,7 @@ fn opts() -> Vec<RustcOptGroup> {
         unstable("display-warnings", |o| {
             o.optflag("", "display-warnings", "to print code warnings when testing doc")
         }),
-        unstable("crate-version", |o| {
+        stable("crate-version", |o| {
             o.optopt("", "crate-version", "crate version to print into documentation", "VERSION")
         }),
         unstable("sort-modules-by-appearance", |o| {

src/test/rustdoc/crate-version.rs

@@ -1,3 +1,3 @@
-// compile-flags: --crate-version=1.3.37 -Z unstable-options
+// compile-flags: --crate-version=1.3.37
 
 // @has 'crate_version/index.html' '//div[@class="block version"]/p' 'Version 1.3.37'