diff options
Diffstat (limited to 'src/libsyntax/ext/deriving/cmp/partial_eq.rs')
| -rw-r--r-- | src/libsyntax/ext/deriving/cmp/partial_eq.rs | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/libsyntax/ext/deriving/cmp/partial_eq.rs b/src/libsyntax/ext/deriving/cmp/partial_eq.rs index f02e5ee1412..61eb81c6755 100644 --- a/src/libsyntax/ext/deriving/cmp/partial_eq.rs +++ b/src/libsyntax/ext/deriving/cmp/partial_eq.rs @@ -29,8 +29,8 @@ pub fn expand_deriving_partial_eq(cx: &mut ExtCtxt, cs_fold( true, // use foldl |cx, span, subexpr, self_f, other_fs| { - let other_f = match other_fs { - [ref o_f] => o_f, + let other_f = match (other_fs.len(), other_fs.get(0)) { + (1, Some(o_f)) => o_f, _ => cx.span_bug(span, "not exactly 2 arguments in `derive(PartialEq)`") }; @@ -46,8 +46,8 @@ pub fn expand_deriving_partial_eq(cx: &mut ExtCtxt, cs_fold( true, // use foldl |cx, span, subexpr, self_f, other_fs| { - let other_f = match other_fs { - [ref o_f] => o_f, + let other_f = match (other_fs.len(), other_fs.get(0)) { + (1, Some(o_f)) => o_f, _ => cx.span_bug(span, "not exactly 2 arguments in `derive(PartialEq)`") }; |