Rollup merge of #140076 - aDotInTheVoid:jsondocline, r=GuillaumeGomez
jsondocck: Require command is at start of line
In one place we use `///``@``` instead of `//``@`.`` The test-runner allowed it, but it probably shouldn't. Ran into by ``@lolbinarycat`` in https://github.com/rust-lang/rust/pull/132748#issuecomment-2816469322:
```
error: unknown disambiguator `?(`
##[error] --> /checkout/tests/rustdoc-json/fns/return_type_alias.rs:3:25
|
3 | ///@ set foo = "$.index[?(``@.name=='Foo')].id"``
| ^^
|
```
Maybe it's also worth erroring on this like we added in #137103
r? ``@GuillaumeGomez``
diff --git a/src/tools/jsondocck/src/main.rs b/src/tools/jsondocck/src/main.rs
index 79e4198..65ad38d 100644
--- a/src/tools/jsondocck/src/main.rs
+++ b/src/tools/jsondocck/src/main.rs
@@ -154,6 +154,7 @@ fn parse<'a>(command_name: &str, negated: bool, args: &'a [String]) -> Option<(S
static LINE_PATTERN: LazyLock<Regex> = LazyLock::new(|| {
RegexBuilder::new(
r#"
+ ^\s*
//@\s+
(?P<negated>!?)
(?P<cmd>[A-Za-z0-9]+(?:-[A-Za-z0-9]+)*)
diff --git a/tests/rustdoc-json/fns/return_type_alias.rs b/tests/rustdoc-json/fns/return_type_alias.rs
index 0aa1db4..c39abc7 100644
--- a/tests/rustdoc-json/fns/return_type_alias.rs
+++ b/tests/rustdoc-json/fns/return_type_alias.rs
@@ -1,6 +1,6 @@
// Regression test for <https://github.com/rust-lang/rust/issues/104851>
-///@ set foo = "$.index[?(@.name=='Foo')].id"
+//@ set foo = "$.index[?(@.name=='Foo')].id"
pub type Foo = i32;
//@ is "$.index[?(@.name=='demo')].inner.function.sig.output.resolved_path.id" $foo
