Import from libcore where possible
diff --git a/src/cxx_vector.rs b/src/cxx_vector.rs
index a7d3f2f..78b8f20 100644
--- a/src/cxx_vector.rs
+++ b/src/cxx_vector.rs
@@ -1,9 +1,9 @@
use crate::cxx_string::CxxString;
-use std::ffi::c_void;
-use std::fmt::{self, Display};
-use std::marker::PhantomData;
-use std::mem;
-use std::ptr;
+use core::ffi::c_void;
+use core::fmt::{self, Display};
+use core::marker::PhantomData;
+use core::mem;
+use core::ptr;
/// Binding to C++ `std::vector<T, std::allocator<T>>`.
///