Rollup merge of #111661 - clubby789:offset-of-erase-regions, r=compiler-errors

Erase regions of type in `offset_of!`

Fixes #111657

Author: Dylan-DPC

compiler/rustc_mir_build/src/build/expr/as_rvalue.rs

@@ -481,9 +481,10 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 }))))
             }
 
-            ExprKind::OffsetOf { container, fields } => {
-                block.and(Rvalue::NullaryOp(NullOp::OffsetOf(fields), container))
-            }
+            ExprKind::OffsetOf { container, fields } => block.and(Rvalue::NullaryOp(
+                NullOp::OffsetOf(fields),
+                this.tcx.erase_regions(container),
+            )),
 
             ExprKind::Literal { .. }
             | ExprKind::NamedConst { .. }

tests/ui/offset-of/offset-of-arg-count.rs

@@ -12,6 +12,11 @@ fn main() {
     offset_of!(S, f.,); //~ ERROR expected identifier
     offset_of!(S, f..); //~ ERROR no rules expected the token
     offset_of!(S, f..,); //~ ERROR no rules expected the token
+    offset_of!(Lt<'static>, bar); // issue #111657
+
 }
 
 struct S { f: u8, }
+struct Lt<'a> {
+    bar: &'a (),
+}