Replace if + unwrap with if let in check_stack

dtolnay · dtolnay · commit 947a09a4a88f · 2022-01-18T19:18:47.000-08:00
diff --git a/compiler/rustc_ast_pretty/src/pp.rs b/compiler/rustc_ast_pretty/src/pp.rs
@@ -379,8 +379,7 @@ impl Printer {
     }
 
     fn check_stack(&mut self, k: usize) {
-        if !self.scan_stack.is_empty() {
-            let x = *self.scan_stack.front().unwrap();
+        if let Some(&x) = self.scan_stack.front() {
             match self.buf[x].token {
                 Token::Begin(_) => {
                     if k > 0 {

Original file line number	Diff line number	Diff line change
`@@ -379,8 +379,7 @@ impl Printer {`
`379`	`379`	`}`
`380`	`380`
`381`	`381`	`fn check_stack(&mut self, k: usize) {`
`382`		`- if !self.scan_stack.is_empty() {`
`383`		`- let x = *self.scan_stack.front().unwrap();`
	`382`	`+ if let Some(&x) = self.scan_stack.front() {`
`384`	`383`	`match self.buf[x].token {`
`385`	`384`	`Token::Begin(_) => {`
`386`	`385`	`if k > 0 {`