Encountering an error is the cold path

dtolnay · dtolnay · commit 788e431fde33 · 2017-12-04T23:51:13.000-08:00
diff --git a/src/de.rs b/src/de.rs
@@ -155,12 +155,14 @@ impl<'de, R: Read<'de>> Deserializer<R> {
     }
 
     /// Error caused by a byte from next_char().
+    #[cold]
     fn error(&self, reason: ErrorCode) -> Error {
         let pos = self.read.position();
         Error::syntax(reason, pos.line, pos.column)
     }
 
     /// Error caused by a byte from peek().
+    #[cold]
     fn peek_error(&self, reason: ErrorCode) -> Error {
         let pos = self.read.peek_position();
         Error::syntax(reason, pos.line, pos.column)

Original file line number	Diff line number	Diff line change
`@@ -155,12 +155,14 @@ impl<'de, R: Read<'de>> Deserializer<R> {`
`155`	`155`	`}`
`156`	`156`
`157`	`157`	`/// Error caused by a byte from next_char().`
	`158`	`+ #[cold]`
`158`	`159`	`fn error(&self, reason: ErrorCode) -> Error {`
`159`	`160`	`let pos = self.read.position();`
`160`	`161`	`Error::syntax(reason, pos.line, pos.column)`
`161`	`162`	`}`
`162`	`163`
`163`	`164`	`/// Error caused by a byte from peek().`
	`165`	`+ #[cold]`
`164`	`166`	`fn peek_error(&self, reason: ErrorCode) -> Error {`
`165`	`167`	`let pos = self.read.peek_position();`
`166`	`168`	`Error::syntax(reason, pos.line, pos.column)`