syntax: remove superfluous borrow

BurntSushi · BurntSushi · commit 7536e055840f · 2023-08-26T08:14:50.000-04:00
Best guess is that the parser used to use something other than a `&amp;str`,
but I can't remember.
diff --git a/regex-syntax/src/ast/parse.rs b/regex-syntax/src/ast/parse.rs
@@ -383,7 +383,7 @@ impl<'s, P: Borrow<Parser>> ParserI<'s, P> {
 
     /// Return a reference to the pattern being parsed.
     fn pattern(&self) -> &str {
-        self.pattern.borrow()
+        self.pattern
     }
 
     /// Create a new error with the given span and error type.

Original file line number	Diff line number	Diff line change
`@@ -383,7 +383,7 @@ impl<'s, P: Borrow<Parser>> ParserI<'s, P> {`
`383`	`383`
`384`	`384`	`/// Return a reference to the pattern being parsed.`
`385`	`385`	`fn pattern(&self) -> &str {`
`386`		`- self.pattern.borrow()`
	`386`	`+ self.pattern`
`387`	`387`	`}`
`388`	`388`
`389`	`389`	`/// Create a new error with the given span and error type.`