Add doctest to ensure that doctests with crate-level attributes are not part of merged doctest

Author: GuillaumeGomez

tests/rustdoc-ui/2024-doctests-crate-attribute.rs

@@ -0,0 +1,22 @@
+//@ check-pass
+//@ compile-flags: --test --test-args=--test-threads=1 -Zunstable-options --edition 2024
+//@ normalize-stdout-test: "tests/rustdoc-ui" -> "$$DIR"
+//@ normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ normalize-stdout-test ".rs:\d+:\d+" -> ".rs:$$LINE:$$COL"
+
+/// This doctest is used to ensure that if a crate attribute is present,
+/// it will not be part of the merged doctests.
+///
+/// ```
+/// #![doc(html_playground_url = "foo")]
+///
+/// pub struct Bar;
+/// ```
+///
+/// This one will allow us to confirm that the doctest above will be a
+/// standalone one (there will be two separate doctests passes).
+///
+/// ```
+/// let x = 12;
+/// ```
+pub struct Foo;

tests/rustdoc-ui/2024-doctests-crate-attribute.stdout

@@ -0,0 +1,12 @@
+
+running 1 test
+test $DIR/2024-doctests-crate-attribute.rs - Foo (line 19) ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+
+
+running 1 test
+test $DIR/2024-doctests-crate-attribute.rs - Foo (line 10) ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+