rollup merge of #20061: aturon/stab-2-vec-slice

Conflicts:
	src/libcollections/slice.rs
	src/libcollections/vec.rs
	src/libstd/sys/windows/os.rs

src/libstd/lib.rs

@@ -158,6 +158,7 @@ pub use alloc::rc;
 pub use core_collections::slice;
 pub use core_collections::str;
 pub use core_collections::string;
+#[stable]
 pub use core_collections::vec;
 
 pub use unicode::char;