3 files changed, 5 insertions, 3 deletions
diff --git a/compiler/rustc_parse/src/parser/expr.rs b/compiler/rustc_parse/src/parser/expr.rs
index 09f706143fa..9fad954adda 100644
--- a/compiler/rustc_parse/src/parser/expr.rs
+++ b/compiler/rustc_parse/src/parser/expr.rs
@@ -1,4 +1,5 @@
 // ignore-tidy-filelength
+
 use super::diagnostics::SnapshotParser;
 use super::pat::{CommaRecoveryMode, Expected, RecoverColon, RecoverComma};
 use super::ty::{AllowPlus, RecoverQPath, RecoverReturnSign};
diff --git a/compiler/rustc_parse/src/parser/item.rs b/compiler/rustc_parse/src/parser/item.rs
index 2db777a9f70..3e1ea7b129d 100644
--- a/compiler/rustc_parse/src/parser/item.rs
+++ b/compiler/rustc_parse/src/parser/item.rs
@@ -1259,7 +1259,7 @@ impl<'a> Parser<'a> {
         self.token.is_keyword(kw::Unsafe)
             && self.is_keyword_ahead(1, &[kw::Extern])
             && self.look_ahead(
-                2 + self.look_ahead(2, |t| t.can_begin_literal_maybe_minus() as usize),
+                2 + self.look_ahead(2, |t| t.can_begin_string_literal() as usize),
                 |t| t.kind == token::OpenDelim(Delimiter::Brace),
             )
     }
@@ -2448,7 +2448,7 @@ impl<'a> Parser<'a> {
                 })
             // `extern ABI fn`
             || self.check_keyword_case(kw::Extern, case)
-                && self.look_ahead(1, |t| t.can_begin_literal_maybe_minus())
+                && self.look_ahead(1, |t| t.can_begin_string_literal())
                 && (self.look_ahead(2, |t| t.is_keyword_case(kw::Fn, case)) ||
                     // this branch is only for better diagnostic in later, `pub` is not allowed here
                     (self.may_recover()
diff --git a/compiler/rustc_parse/src/parser/pat.rs b/compiler/rustc_parse/src/parser/pat.rs
index 03aea0888d9..6f2b7177159 100644
--- a/compiler/rustc_parse/src/parser/pat.rs
+++ b/compiler/rustc_parse/src/parser/pat.rs
@@ -939,7 +939,8 @@ impl<'a> Parser<'a> {
             || self.look_ahead(dist, |t| {
                 t.is_path_start() // e.g. `MY_CONST`;
                 || t.kind == token::Dot // e.g. `.5` for recovery;
-                || t.can_begin_literal_maybe_minus() // e.g. `42`.
+                || matches!(t.kind, token::Literal(..) | token::BinOp(token::Minus))
+                || t.is_bool_lit()
                 || t.is_whole_expr()
                 || t.is_lifetime() // recover `'a` instead of `'a'`
                 || (self.may_recover() // recover leading `(`