Resolve clippy warnings

schemars/src/flatten.rs

@@ -171,8 +171,10 @@ fn is_null_type(schema: &Schema) -> bool {
         Schema::Object(s) => s,
         _ => return false,
     };
-    match &s.instance_type {
-        Some(SingleOrVec::Single(t)) if **t == InstanceType::Null => true,
-        _ => false,
-    }
+    let instance_type = match &s.instance_type {
+        Some(SingleOrVec::Single(t)) => t,
+        _ => return false,
+    };
+
+    **instance_type == InstanceType::Null
 }

schemars/src/gen.rs

@@ -18,6 +18,7 @@ use std::{any::Any, collections::HashSet, fmt::Debug};
 /// The default settings currently conform to [JSON Schema Draft 7](https://json-schema.org/specification-links.html#draft-7), but this is liable to change in a future version of Schemars if support for other JSON Schema versions is added.
 /// If you require your generated schemas to conform to draft 7, consider using the [`draft07`](#method.draft07) method.
 #[derive(Debug, Clone)]
+#[non_exhaustive]
 pub struct SchemaSettings {
     /// If `true`, schemas for [`Option<T>`](Option) will include a `nullable` property.
     ///
@@ -45,7 +46,6 @@ pub struct SchemaSettings {
     ///
     /// Defaults to `false`.
     pub inline_subschemas: bool,
-    _hidden: (),
 }
 
 impl Default for SchemaSettings {
@@ -64,7 +64,6 @@ impl SchemaSettings {
             meta_schema: Some("http://json-schema.org/draft-07/schema#".to_owned()),
             visitors: vec![Box::new(RemoveRefSiblings)],
             inline_subschemas: false,
-            _hidden: (),
         }
     }
 
@@ -77,7 +76,6 @@ impl SchemaSettings {
             meta_schema: Some("https://json-schema.org/draft/2019-09/schema".to_owned()),
             visitors: Vec::default(),
             inline_subschemas: false,
-            _hidden: (),
         }
     }
 
@@ -101,7 +99,6 @@ impl SchemaSettings {
                 }),
             ],
             inline_subschemas: false,
-            _hidden: (),
         }
     }