4 - Make more use of `let_chains`

Continuation of #94376.

cc #53667

1 files changed, 7 insertions, 8 deletions

diff --git a/compiler/rustc_parse/src/lexer/tokentrees.rs b/compiler/rustc_parse/src/lexer/tokentrees.rs
index 6233549dc85..8318aec8726 100644
--- a/compiler/rustc_parse/src/lexer/tokentrees.rs
+++ b/compiler/rustc_parse/src/lexer/tokentrees.rs
@@ -282,14 +282,13 @@ struct TokenStreamBuilder {
 
 impl TokenStreamBuilder {
     fn push(&mut self, (tree, joint): TreeAndSpacing) {
-        if let Some((TokenTree::Token(prev_token), Joint)) = self.buf.last() {
-            if let TokenTree::Token(token) = &tree {
-                if let Some(glued) = prev_token.glue(token) {
-                    self.buf.pop();
-                    self.buf.push((TokenTree::Token(glued), joint));
-                    return;
-                }
-            }
+        if let Some((TokenTree::Token(prev_token), Joint)) = self.buf.last()
+            && let TokenTree::Token(token) = &tree
+            && let Some(glued) = prev_token.glue(token)
+        {
+            self.buf.pop();
+            self.buf.push((TokenTree::Token(glued), joint));
+            return;
         }
         self.buf.push((tree, joint))
     }