Auto merge of #88934 - tmiasko:trace-log, r=davidtwco

[rust.git] / compiler / rustc_typeck / src / check / coercion.rs

diff --git a/compiler/rustc_typeck/src/check/coercion.rs b/compiler/rustc_typeck/src/check/coercion.rs
index 3bfab9d513f375e6540a3f7471f3c3342d172485..013aecae586ca93369917a4e7008377de62e4dbb 100644 (file)
--- a/compiler/rustc_typeck/src/check/coercion.rs
+++ b/compiler/rustc_typeck/src/check/coercion.rs
@@ -707,13 +707,7 @@ fn coerce_unsized(&self, mut source: Ty<'tcx>, mut target: Ty<'tcx>) -> CoerceRe
 
                 // Object safety violations or miscellaneous.
                 Err(err) => {
-                    self.report_selection_error(
-                        obligation.clone(),
-                        &obligation,
-                        &err,
-                        false,
-                        false,
-                    );
+                    self.report_selection_error(obligation.clone(), &obligation, &err, false);
                     // Treat this like an obligation and follow through
                     // with the unsizing - the lack of a coercion should
                     // be silent, as it causes a type mismatch later.
@@ -1003,6 +997,12 @@ fn try_find_coercion_lub<E>(
             exprs.len()
         );
 
+        // The following check fixes #88097, where the compiler erroneously
+        // attempted to coerce a closure type to itself via a function pointer.
+        if prev_ty == new_ty {
+            return Ok(prev_ty);
+        }
+
         // Special-case that coercion alone cannot handle:
         // Function items or non-capturing closures of differing IDs or InternalSubsts.
         let (a_sig, b_sig) = {