Rename doctest attribute standalone-crate into standalone_crate for coherency

Author: GuillaumeGomez

library/core/src/panic/location.rs

@@ -44,7 +44,7 @@ impl<'a> Location<'a> {
     ///
     /// # Examples
     ///
-    /// ```standalone-crate
+    /// ```standalone_crate
     /// use std::panic::Location;
     ///
     /// /// Returns the [`Location`] at which it is called.

src/doc/rustdoc/src/write-documentation/documentation-tests.md

@@ -414,11 +414,11 @@ In some cases, doctests cannot be merged. For example, if you have:
 The problem with this code is that, if you change any other doctests, it'll likely break when
 runing `rustdoc --test`, making it tricky to maintain.
 
-This is where the `standalone-crate` attribute comes in: it tells `rustdoc` that a doctest
+This is where the `standalone_crate` attribute comes in: it tells `rustdoc` that a doctest
 should not be merged with the others. So the previous code should use it:
 
 ```rust
-//! ```standalone-crate
+//! ```standalone_crate
 //! let location = std::panic::Location::caller();
 //! assert_eq!(location.line(), 4);
 //! ```

src/librustdoc/html/markdown.rs

@@ -1264,7 +1264,7 @@ impl LangString {
                         seen_rust_tags = !seen_other_tags || seen_rust_tags;
                         data.no_run = true;
                     }
-                    LangStringToken::LangToken("standalone-crate") => {
+                    LangStringToken::LangToken("standalone_crate") => {
                         data.standalone_crate = true;
                         seen_rust_tags = !seen_other_tags || seen_rust_tags;
                     }
@@ -1315,12 +1315,12 @@ impl LangString {
                                 "use `test_harness` to run functions marked `#[test]` instead of a \
                                 potentially-implicit `main` function",
                             ),
-                            "standalone" | "standalone_crate" => {
+                            "standalone" | "standalone_crate" | "standalone-crate" => {
                                 if let Some(extra) = extra
                                     && extra.sp.at_least_rust_2024()
                                 {
                                     Some(
-                                        "use `standalone-crate` to compile this code block \
+                                        "use `standalone_crate` to compile this code block \
                                         separately",
                                     )
                                 } else {

tests/run-make/doctests-merge/doctest-standalone.rs

@@ -1,11 +1,11 @@
 #![crate_name = "foo"]
 #![crate_type = "lib"]
 
-//! ```standalone-crate
+//! ```standalone_crate
 //! foo::init();
 //! ```
 
-/// ```standalone-crate
+/// ```standalone_crate
 /// foo::init();
 /// ```
 pub fn init() {

tests/rustdoc-ui/doctest/standalone-warning-2024.rs

@@ -11,6 +11,6 @@
 //! bla
 //! ```
 //!
-//! ```standalone_crate
+//! ```standalone-crate
 //! bla
 //! ```

tests/rustdoc-ui/doctest/standalone-warning-2024.stderr

@@ -5,12 +5,12 @@ error: unknown attribute `standalone`
 11 | | //! bla
 12 | | //! ```
 13 | | //!
-14 | | //! ```standalone_crate
+14 | | //! ```standalone-crate
 15 | | //! bla
 16 | | //! ```
    | |_______^
    |
-   = help: use `standalone-crate` to compile this code block separately
+   = help: use `standalone_crate` to compile this code block separately
    = help: this code block may be skipped during testing, because unknown attributes are treated as markers for code samples written in other programming languages, unless it is also explicitly marked as `rust`
 note: the lint level is defined here
   --> $DIR/standalone-warning-2024.rs:8:9
@@ -19,19 +19,19 @@ note: the lint level is defined here
    |         ^^^^^^^^
    = note: `#[deny(rustdoc::invalid_codeblock_attributes)]` implied by `#[deny(warnings)]`
 
-error: unknown attribute `standalone_crate`
+error: unknown attribute `standalone-crate`
   --> $DIR/standalone-warning-2024.rs:10:1
    |
 10 | / //! ```standalone
 11 | | //! bla
 12 | | //! ```
 13 | | //!
-14 | | //! ```standalone_crate
+14 | | //! ```standalone-crate
 15 | | //! bla
 16 | | //! ```
    | |_______^
    |
-   = help: use `standalone-crate` to compile this code block separately
+   = help: use `standalone_crate` to compile this code block separately
    = help: this code block may be skipped during testing, because unknown attributes are treated as markers for code samples written in other programming languages, unless it is also explicitly marked as `rust`
 
 error: aborting due to 2 previous errors

tests/rustdoc-ui/doctest/standalone-warning.rs

@@ -5,6 +5,6 @@
 //! bla
 //! ```
 //!
-//! ```standalone_crate
+//! ```standalone-crate
 //! bla
 //! ```