Format error and typeof types (#4416)

* Add a test for #4357

* Format error and typeof types

1 files changed, 11 insertions, 2 deletions

diff --git a/src/types.rs b/src/types.rs
index 7eeee2ac979..6e1fc8fc387 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -7,7 +7,9 @@ use rustc_span::{symbol::kw, BytePos, Pos, Span};
 use crate::comment::{combine_strs_with_missing_comments, contains_comment};
 use crate::config::lists::*;
 use crate::config::{IndentStyle, TypeDensity, Version};
-use crate::expr::{format_expr, rewrite_assign_rhs, rewrite_tuple, rewrite_unary_prefix, ExprType};
+use crate::expr::{
+    format_expr, rewrite_assign_rhs, rewrite_call, rewrite_tuple, rewrite_unary_prefix, ExprType,
+};
 use crate::lists::{
     definitive_tactic, itemize_list, write_list, ListFormatting, ListItem, Separator,
 };
@@ -797,7 +799,14 @@ impl Rewrite for ast::Ty {
                 })
             }
             ast::TyKind::CVarArgs => Some("...".to_owned()),
-            ast::TyKind::Err | ast::TyKind::Typeof(..) => unreachable!(),
+            ast::TyKind::Err => Some(context.snippet(self.span).to_owned()),
+            ast::TyKind::Typeof(ref anon_const) => rewrite_call(
+                context,
+                "typeof",
+                &[anon_const.value.clone()],
+                self.span,
+                shape,
+            ),
         }
     }
 }