fix(doc): do not parse inline when output is json for external crate

src/librustdoc/clean/mod.rs

@@ -2381,7 +2381,8 @@ fn clean_extern_crate<'tcx>(
                     Some(l) => attr::list_contains_name(&l, sym::inline),
                     None => false,
                 }
-        });
+        })
+        && !cx.output_format.is_json();
 
     let krate_owner_def_id = krate.owner_id.to_def_id();
     if please_inline {

src/librustdoc/clean/types.rs

@@ -2019,7 +2019,7 @@ impl Variant {
 
 #[derive(Clone, Debug)]
 pub(crate) struct Discriminant {
-    // In the case of cross crate re-exports, we don't have the nessesary information
+    // In the case of cross crate re-exports, we don't have the necessary information
     // to reconstruct the expression of the discriminant, only the value.
     pub(super) expr: Option<BodyId>,
     pub(super) value: DefId,

tests/rustdoc-ui/intra-doc/auxiliary/inner-crate-enum.rs

@@ -0,0 +1,3 @@
+pub enum O {
+    L = -1,
+}

tests/rustdoc-ui/intra-doc/inline-external-enum.rs

@@ -0,0 +1,8 @@
+// check-pass
+// aux-build: inner-crate-enum.rs
+// compile-flags:-Z unstable-options --output-format json
+
+#[doc(inline)]
+pub extern crate inner_crate_enum;
+
+fn main() {}