Auto merge of #87246 - rust-lang:placeholder-pretty, r=nikomatsakis

When pretty printing, name placeholders as bound regions

Split from #85499

When we see a placeholder that we are going to print, treat it as a bound var (and add it to a `for<...>`

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/rustc_infer/src/infer/error_reporting/mod.rs b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
index 426db95aca1..f885c0a4b87 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/mod.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
@@ -995,7 +995,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         let get_lifetimes = |sig| {
             use rustc_hir::def::Namespace;
             let mut s = String::new();
-            let (_, (sig, reg)) = ty::print::FmtPrinter::new(self.tcx, &mut s, Namespace::TypeNS)
+            let (_, sig, reg) = ty::print::FmtPrinter::new(self.tcx, &mut s, Namespace::TypeNS)
                 .name_all_regions(sig)
                 .unwrap();
             let lts: Vec<String> = reg.into_iter().map(|(_, kind)| kind.to_string()).collect();