CStr is available in core since Rust 1.64

Author: dtolnay

src/fallback.rs

@@ -13,6 +13,7 @@ use core::cell::RefCell;
 use core::cmp;
 #[cfg(all(span_locations, not(fuzzing)))]
 use core::cmp::Ordering;
+use core::ffi::CStr;
 use core::fmt::{self, Debug, Display, Write};
 use core::mem::ManuallyDrop;
 #[cfg(span_locations)]
@@ -22,7 +23,6 @@ use core::ptr;
 use core::str;
 #[cfg(feature = "proc-macro")]
 use core::str::FromStr;
-use std::ffi::CStr;
 #[cfg(wrap_proc_macro)]
 use std::panic;
 #[cfg(span_locations)]

src/lib.rs

@@ -175,14 +175,14 @@ use crate::marker::{ProcMacroAutoTraits, MARKER};
 #[cfg(procmacro2_semver_exempt)]
 use crate::rustc_literal_escaper::MixedUnit;
 use core::cmp::Ordering;
+use core::ffi::CStr;
 use core::fmt::{self, Debug, Display};
 use core::hash::{Hash, Hasher};
 #[cfg(span_locations)]
 use core::ops::Range;
 use core::ops::RangeBounds;
 use core::str::FromStr;
 use std::error::Error;
-use std::ffi::CStr;
 #[cfg(span_locations)]
 use std::path::PathBuf;
 

src/rustc_literal_escaper.rs

@@ -5,7 +5,7 @@
 //! turning escape sequences into the values they represent.
 
 use crate::num::NonZeroChar;
-use std::ffi::CStr;
+use core::ffi::CStr;
 use std::num::NonZeroU8;
 use std::ops::Range;
 use std::str::Chars;

src/wrapper.rs

@@ -9,11 +9,11 @@ use crate::probe::proc_macro_span_file;
 #[cfg(all(span_locations, proc_macro_span_location))]
 use crate::probe::proc_macro_span_location;
 use crate::{Delimiter, Punct, Spacing, TokenTree};
+use core::ffi::CStr;
 use core::fmt::{self, Debug, Display};
 #[cfg(span_locations)]
 use core::ops::Range;
 use core::ops::RangeBounds;
-use std::ffi::CStr;
 #[cfg(span_locations)]
 use std::path::PathBuf;