improved_slice_patterns now returns ownership on error

1 files changed, 1 insertions, 1 deletions

diff --git a/dhall_core/src/parser.rs b/dhall_core/src/parser.rs
index 051a4e6..31249a9 100644
--- a/dhall_core/src/parser.rs
+++ b/dhall_core/src/parser.rs
@@ -176,7 +176,7 @@ macro_rules! make_parser {
             [x..] => Err(
                 format!("Unexpected children: {:?}", x.collect::<Vec<_>>())
             )?,
-        ).ok_or_else(|| -> String { unreachable!() })?;
+        ).map_err(|_| -> String { unreachable!() })?;
         Ok(ParsedValue::$group(res))
     });
     (@body,