Rollup merge of #134797 - spastorino:ergonomic-ref-counting-1, r=nikomatsakis

Ergonomic ref counting

This is an experimental first version of ergonomic ref counting.

This first version implements most of the RFC but doesn't implement any of the optimizations. This was left for following iterations.

RFC: https://github.com/rust-lang/rfcs/pull/3680
Tracking issue: https://github.com/rust-lang/rust/issues/132290
Project goal: https://github.com/rust-lang/rust-project-goals/issues/107

r? ```@nikomatsakis```

1 files changed, 28 insertions, 0 deletions

diff --git a/compiler/rustc_parse/src/errors.rs b/compiler/rustc_parse/src/errors.rs
index 8d2fd595942..e090d9cf760 100644
--- a/compiler/rustc_parse/src/errors.rs
+++ b/compiler/rustc_parse/src/errors.rs
@@ -106,6 +106,19 @@ pub(crate) struct IncorrectUseOfAwait {
     pub span: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(parse_incorrect_use_of_use)]
+pub(crate) struct IncorrectUseOfUse {
+    #[primary_span]
+    #[suggestion(
+        parse_parentheses_suggestion,
+        style = "verbose",
+        code = "",
+        applicability = "machine-applicable"
+    )]
+    pub span: Span,
+}
+
 #[derive(Subdiagnostic)]
 #[multipart_suggestion(
     parse_incorrect_use_of_await_postfix_suggestion,
@@ -1500,6 +1513,14 @@ pub(crate) struct AsyncMoveOrderIncorrect {
 }
 
 #[derive(Diagnostic)]
+#[diag(parse_async_use_order_incorrect)]
+pub(crate) struct AsyncUseOrderIncorrect {
+    #[primary_span]
+    #[suggestion(style = "verbose", code = "async use", applicability = "maybe-incorrect")]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
 #[diag(parse_double_colon_in_bound)]
 pub(crate) struct DoubleColonInBound {
     #[primary_span]
@@ -1668,6 +1689,13 @@ pub(crate) struct AsyncMoveBlockIn2015 {
 }
 
 #[derive(Diagnostic)]
+#[diag(parse_async_use_block_in_2015)]
+pub(crate) struct AsyncUseBlockIn2015 {
+    #[primary_span]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
 #[diag(parse_async_bound_modifier_in_2015)]
 pub(crate) struct AsyncBoundModifierIn2015 {
     #[primary_span]