Auto merge of #21717 - nick29581:prelude-fullrange, r=acrichto

r? @alexcrichton 

1 files changed, 11 insertions, 0 deletions

diff --git a/src/libstd/sys/common/wtf8.rs b/src/libstd/sys/common/wtf8.rs
index bc072155063..fdcb0c19f30 100644
--- a/src/libstd/sys/common/wtf8.rs
+++ b/src/libstd/sys/common/wtf8.rs
@@ -680,6 +680,7 @@ impl ops::Index<ops::RangeTo<usize>> for Wtf8 {
     }
 }
 
+#[cfg(stage0)]
 impl ops::Index<ops::FullRange> for Wtf8 {
     type Output = Wtf8;
 
@@ -689,6 +690,16 @@ impl ops::Index<ops::FullRange> for Wtf8 {
     }
 }
 
+#[cfg(not(stage0))]
+impl ops::Index<ops::RangeFull> for Wtf8 {
+    type Output = Wtf8;
+
+    #[inline]
+    fn index(&self, _range: &ops::RangeFull) -> &Wtf8 {
+        self
+    }
+}
+
 #[inline]
 fn decode_surrogate(second_byte: u8, third_byte: u8) -> u16 {
     // The first byte is assumed to be 0xED