Rollup merge of #101409 - WaffleLapkin:rust_2021_compatibility_no_warn_in_2021_crates, r=TaKO8Ki

Don't fire `rust_2021_incompatible_closure_captures` in `edition = 2021` crates

Fixes #101284

2 files changed, 6 insertions, 2 deletions

diff --git a/compiler/rustc_lint_defs/src/builtin.rs b/compiler/rustc_lint_defs/src/builtin.rs
index ca01599acc8..2e3a06fcbb7 100644
--- a/compiler/rustc_lint_defs/src/builtin.rs
+++ b/compiler/rustc_lint_defs/src/builtin.rs
@@ -3407,7 +3407,7 @@ declare_lint! {
     ///
     /// ### Example of drop reorder
     ///
-    /// ```rust,compile_fail
+    /// ```rust,edition2018,compile_fail
     /// #![deny(rust_2021_incompatible_closure_captures)]
     /// # #![allow(unused)]
     ///
@@ -3443,7 +3443,7 @@ declare_lint! {
     ///
     /// ### Example of auto-trait
     ///
-    /// ```rust,compile_fail
+    /// ```rust,edition2018,compile_fail
     /// #![deny(rust_2021_incompatible_closure_captures)]
     /// use std::thread;
     ///
diff --git a/compiler/rustc_typeck/src/check/upvar.rs b/compiler/rustc_typeck/src/check/upvar.rs
index 0afc153300b..0b207a6c0be 100644
--- a/compiler/rustc_typeck/src/check/upvar.rs
+++ b/compiler/rustc_typeck/src/check/upvar.rs
@@ -2024,6 +2024,10 @@ fn should_do_rust_2021_incompatible_closure_captures_analysis(
     tcx: TyCtxt<'_>,
     closure_id: hir::HirId,
 ) -> bool {
+    if tcx.sess.rust_2021() {
+        return false;
+    }
+
     let (level, _) =
         tcx.lint_level_at_node(lint::builtin::RUST_2021_INCOMPATIBLE_CLOSURE_CAPTURES, closure_id);