no_std: Don't use the std prelude

By being `no_std` and then using the `std` crate when the `std`
feature is enabled, it is easier to detect when something
requires `std` during development.

Author: waywardmonkeys

src/lib.rs

@@ -6,10 +6,13 @@
 
 #![warn(clippy::doc_markdown)]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
-#![cfg_attr(all(not(feature = "std"), not(test)), no_std)]
+#![no_std]
 
 extern crate alloc;
 
+#[cfg(feature = "std")]
+extern crate std;
+
 use alloc::string::{String, ToString};
 use core::fmt;
 use core::str::FromStr;

src/webdriver.rs

@@ -41,6 +41,9 @@
 //!
 //! Specification: <https://w3c.github.io/webdriver/>
 
+use alloc::borrow::ToOwned;
+use alloc::string::{String, ToString};
+use alloc::vec::Vec;
 use std::collections::HashSet;
 
 use unicode_segmentation::UnicodeSegmentation;