Minor reorganization

src/error.rs

@@ -1,4 +1,20 @@
-use crate::Mark;
+/// The pointer position.
+#[derive(Copy, Clone, Default, Debug)]
+#[non_exhaustive]
+pub struct Mark {
+    /// The position index.
+    pub index: u64,
+    /// The position line.
+    pub line: u64,
+    /// The position column.
+    pub column: u64,
+}
+
+impl std::fmt::Display for Mark {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "line {} column {}", self.line, self.column)
+    }
+}
 
 #[derive(Debug, thiserror::Error)]
 pub enum EmitterError {

src/lib.rs

@@ -64,7 +64,7 @@ pub use crate::scanner::yaml_parser_scan;
 pub use crate::writer::yaml_emitter_flush;
 pub use crate::yaml::{
     AliasData, Break, Document, Emitter, EmitterState, Encoding, Event, EventData, MappingStyle,
-    Mark, Node, NodeItem, NodePair, Parser, ParserState, ScalarStyle, SequenceStyle, SimpleKey,
+    Node, NodeItem, NodePair, Parser, ParserState, ScalarStyle, SequenceStyle, SimpleKey,
     TagDirective, Token, TokenData, VersionDirective,
 };
 #[doc(hidden)]

src/yaml.rs

@@ -2,7 +2,7 @@ use alloc::collections::VecDeque;
 use alloc::string::String;
 use alloc::vec::Vec;
 
-use crate::{api::yaml_parser_new, yaml_emitter_new};
+use crate::{api::yaml_parser_new, yaml_emitter_new, Mark};
 
 pub use self::Encoding::*;
 
@@ -81,18 +81,6 @@ pub enum Break {
     CrLn = 3,
 }
 
-/// The pointer position.
-#[derive(Copy, Clone, Default, Debug)]
-#[non_exhaustive]
-pub struct Mark {
-    /// The position index.
-    pub index: u64,
-    /// The position line.
-    pub line: u64,
-    /// The position column.
-    pub column: u64,
-}
-
 /// Scalar styles.
 #[derive(Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
 #[non_exhaustive]