Resolve clippy filter_map_next pedantic lint

Author: dtolnay

impl/src/lib.rs

@@ -1,7 +1,6 @@
 #![allow(
     clippy::blocks_in_if_conditions,
     clippy::cast_possible_truncation,
-    clippy::filter_map_next,
     clippy::map_unwrap_or,
     clippy::needless_pass_by_value,
     clippy::option_if_let_else,

impl/src/valid.rs

@@ -23,7 +23,7 @@ impl Struct<'_> {
                     "#[error(transparent)] requires exactly one field",
                 ));
             }
-            if let Some(source) = self.fields.iter().filter_map(|f| f.attrs.source).next() {
+            if let Some(source) = self.fields.iter().find_map(|f| f.attrs.source) {
                 return Err(Error::new_spanned(
                     source,
                     "transparent error struct can't contain #[source]",
@@ -78,7 +78,7 @@ impl Variant<'_> {
                     "#[error(transparent)] requires exactly one field",
                 ));
             }
-            if let Some(source) = self.fields.iter().filter_map(|f| f.attrs.source).next() {
+            if let Some(source) = self.fields.iter().find_map(|f| f.attrs.source) {
                 return Err(Error::new_spanned(
                     source,
                     "transparent variant can't contain #[source]",