Auto merge of #65793 - Centril:rollup-v40xke9, r=Centril

Rollup of 9 pull requests

Successful merges:

 - #62959 (Add by-value iterator for arrays )
 - #65390 (Add long error explanation for E0576)
 - #65408 (reorder config.toml.example options and add one missing option)
 - #65414 (ignore uninhabited non-exhaustive variant fields)
 - #65666 (Deprecated proc_macro doesn't trigger warning on build library)
 - #65742 (Pre-expansion gate most of the things)
 - #65747 (Adjust the tracking issue for `untagged_unions`.)
 - #65763 (Changed APIT with explicit generic args span to specific arg spans)
 - #65775 (Fix more `ReEmpty` ICEs)

Failed merges:

 - #65519 (trait-based structural match implementation)

r? @ghost

1 files changed, 4 insertions, 0 deletions

diff --git a/src/libsyntax/parse/parser/generics.rs b/src/libsyntax/parse/parser/generics.rs
index bfcb0042a75..51caae69c86 100644
--- a/src/libsyntax/parse/parser/generics.rs
+++ b/src/libsyntax/parse/parser/generics.rs
@@ -55,11 +55,15 @@ impl<'a> Parser<'a> {
     }
 
     fn parse_const_param(&mut self, preceding_attrs: Vec<Attribute>) -> PResult<'a, GenericParam> {
+        let lo = self.token.span;
+
         self.expect_keyword(kw::Const)?;
         let ident = self.parse_ident()?;
         self.expect(&token::Colon)?;
         let ty = self.parse_ty()?;
 
+        self.sess.gated_spans.const_generics.borrow_mut().push(lo.to(self.prev_span));
+
         Ok(GenericParam {
             ident,
             id: ast::DUMMY_NODE_ID,