remove collections::range::RangeArgument

was already moved to ops::RangeBounds (see #30877)

Author: coryshrmn

src/libstd/collections/mod.rs

@@ -437,14 +437,6 @@ pub use self::hash_map::HashMap;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::hash_set::HashSet;
 
-#[unstable(feature = "collections_range", issue = "30877")]
-#[rustc_deprecated(reason = "renamed and moved to `std::ops::RangeBounds`", since = "1.26.0")]
-#[doc(hidden)]
-/// Range syntax
-pub mod range {
-    pub use ops::RangeBounds as RangeArgument;
-}
-
 #[unstable(feature = "try_reserve", reason = "new API", issue="48043")]
 pub use heap::CollectionAllocErr;