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-rw-r--r--compiler/rustc_middle/src/ty/sty.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index 29ae42be096..82dec7d98ad 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -1436,7 +1436,7 @@ pub struct ConstVid<'tcx> {
rustc_index::newtype_index! {
/// A **region** (lifetime) **v**ariable **ID**.
#[derive(HashStable)]
- #[debug_format = "'_#{}r"]
+ #[debug_format = "'?{}"]
pub struct RegionVid {}
}