Parse inline const expressions

compiler/rustc_parse/src/parser/expr.rs

@@ -1060,6 +1060,8 @@ impl<'a> Parser<'a> {
             })
         } else if self.eat_keyword(kw::Unsafe) {
             self.parse_block_expr(None, lo, BlockCheckMode::Unsafe(ast::UserProvided), attrs)
+        } else if self.check_inline_const() {
+            self.parse_const_expr(lo.to(self.token.span))
         } else if self.is_do_catch_block() {
             self.recover_do_catch(attrs)
         } else if self.is_try_block() {