Auto merge of #52680 - Mark-Simulacrum:rollup, r=Mark-Simulacrum

Rollup of 7 pull requests

Successful merges:

 - #52391 (Add unaligned volatile intrinsics)
 - #52402 (impl PartialEq+Eq for BuildHasherDefault)
 - #52645 (Allow declaring existential types inside blocks)
 - #52656 (Stablize Redox Unix Sockets)
 - #52658 (Prefer `Option::map`/etc over `match` wherever it improves clarity)
 - #52668 (clarify pointer offset function safety concerns)
 - #52677 (Release notes: add some missing 1.28 libs stabilization)

Failed merges:

r? @ghost

1 files changed, 6 insertions, 0 deletions

diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 54376797dea..64309dd9b8b 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -4391,6 +4391,11 @@ impl<'a> Parser<'a> {
         self.token.is_keyword(keywords::Extern) && self.look_ahead(1, |t| t != &token::ModSep)
     }
 
+    fn is_existential_type_decl(&self) -> bool {
+        self.token.is_keyword(keywords::Existential) &&
+        self.look_ahead(1, |t| t.is_keyword(keywords::Type))
+    }
+
     fn is_auto_trait_item(&mut self) -> bool {
         // auto trait
         (self.token.is_keyword(keywords::Auto)
@@ -4495,6 +4500,7 @@ impl<'a> Parser<'a> {
                   !self.is_union_item() &&
                   !self.is_crate_vis() &&
                   !self.is_extern_non_path() &&
+                  !self.is_existential_type_decl() &&
                   !self.is_auto_trait_item() {
             let pth = self.parse_path(PathStyle::Expr)?;