Make Region::as_var infallible.

It's what all the call sites require.
2023-04-12 15:36:03 +10:00
parent 9693b178fc
commit c802694bda
3 changed files with 7 additions and 18 deletions
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -1772,10 +1772,10 @@ impl<'tcx> Region<'tcx> {
        matches!(self.kind(), ty::ReVar(_))
    }

-    pub fn as_var(self) -> Option<RegionVid> {
+    pub fn as_var(self) -> RegionVid {
        match self.kind() {
-            ty::ReVar(vid) => Some(vid),
-            _ => None,
+            ty::ReVar(vid) => vid,
+            _ => bug!("expected region {:?} to be of kind ReVar", self),
        }
    }
 }