Rollup merge of rust-lang#22274 - pnkfelix:retag-slicing-syntax-as-accepted, r=nikomatsakis

 Re-tag `slicing_syntax` as `Accepted`.

Rollup merge (373cbab) of PR rust-lang#20723
accidentally reverted a portion of commit
8327bcc which shifted
`slicing_syntax` from Active to Accepted.

Author: Manishearth

src/libsyntax/feature_gate.rs

@@ -79,7 +79,7 @@ static KNOWN_FEATURES: &'static [(&'static str, &'static str, Status)] = &[
     ("tuple_indexing", "1.0.0", Accepted),
     ("associated_types", "1.0.0", Accepted),
     ("visible_private_types", "1.0.0", Active),
-    ("slicing_syntax", "1.0.0", Active),
+    ("slicing_syntax", "1.0.0", Accepted),
     ("box_syntax", "1.0.0", Active),
     ("on_unimplemented", "1.0.0", Active),
     ("simd_ffi", "1.0.0", Active),