Use if-let guards in the codebase

2 files changed, 7 insertions, 5 deletions

diff --git a/compiler/rustc_ast/src/attr/mod.rs b/compiler/rustc_ast/src/attr/mod.rs
index 41121d095f3..81195f7fb5c 100644
--- a/compiler/rustc_ast/src/attr/mod.rs
+++ b/compiler/rustc_ast/src/attr/mod.rs
@@ -564,11 +564,11 @@ impl NestedMetaItem {
         I: Iterator<Item = TokenTree>,
     {
         match tokens.peek() {
-            Some(TokenTree::Token(token)) => {
-                if let Ok(lit) = Lit::from_token(token) {
-                    tokens.next();
-                    return Some(NestedMetaItem::Literal(lit));
-                }
+            Some(TokenTree::Token(token))
+                if let Ok(lit) = Lit::from_token(token) =>
+            {
+                tokens.next();
+                return Some(NestedMetaItem::Literal(lit));
             }
             Some(TokenTree::Delimited(_, token::NoDelim, inner_tokens)) => {
                 let inner_tokens = inner_tokens.clone();
diff --git a/compiler/rustc_ast/src/lib.rs b/compiler/rustc_ast/src/lib.rs
index 502bd69e6a9..ef3f6035085 100644
--- a/compiler/rustc_ast/src/lib.rs
+++ b/compiler/rustc_ast/src/lib.rs
@@ -11,10 +11,12 @@
 #![feature(box_patterns)]
 #![cfg_attr(bootstrap, feature(const_fn_transmute))]
 #![feature(crate_visibility_modifier)]
+#![feature(if_let_guard)]
 #![feature(iter_zip)]
 #![feature(label_break_value)]
 #![feature(nll)]
 #![feature(min_specialization)]
+#![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
 #![recursion_limit = "256"]
 
 #[macro_use]