style: Fix item visibility

Author: epage

src/error.rs

@@ -5,6 +5,7 @@ use std::result;
 use serde::de;
 use serde::ser;
 
+#[allow(unnameable_types)] // Unsure if/how to expose this
 #[derive(Debug)]
 pub enum Unexpected {
     Bool(bool),

src/file/source/mod.rs

@@ -17,6 +17,7 @@ where
     ) -> Result<FileSourceResult, Box<dyn Error + Send + Sync>>;
 }
 
+#[allow(unnameable_types)] // Unsure if/how to expose this
 pub struct FileSourceResult {
     pub(crate) uri: Option<String>,
     pub(crate) content: String,

src/ser.rs

@@ -8,7 +8,7 @@ use crate::value::{Value, ValueKind};
 use crate::Config;
 
 #[derive(Default, Debug)]
-pub struct ConfigSerializer {
+pub(crate) struct ConfigSerializer {
     keys: Vec<SerKey>,
     pub output: Config,
 }
@@ -31,7 +31,7 @@ pub(crate) enum Unreachable {}
 ///
 /// Existence of this wrapper implies that `.0.keys.last()` is
 /// `Some(SerKey::Seq(next_index))`.
-pub struct SeqSerializer<'a>(&'a mut ConfigSerializer);
+pub(crate) struct SeqSerializer<'a>(&'a mut ConfigSerializer);
 
 impl ConfigSerializer {
     fn serialize_primitive<T>(&mut self, value: T) -> Result<()>