Move CStr and CString out of "std" feature

.github/workflows/build.yml

@@ -29,7 +29,7 @@ jobs:
     strategy:
       matrix:
         target: [wasm32-wasi, x86_64-unknown-redox]
-        version: [1.56.0, stable, beta, nightly]
+        version: [1.64.0, stable, beta, nightly]
         include:
         - target: x86_64-fortanix-unknown-sgx
           version: nightly
@@ -44,4 +44,4 @@ jobs:
     strategy:
       matrix:
         platform: [macos-latest, ubuntu-latest, windows-latest]
-        version: [1.56.0, stable, beta, nightly]
+        version: [1.64.0, stable, beta, nightly]

Cargo.toml

@@ -3,7 +3,7 @@ name = "uniquote"
 version = "3.2.1"
 authors = ["dylni"]
 edition = "2021"
-rust-version = "1.56.0"
+rust-version = "1.64.0"
 description = """
 Quote strings for clear display in output
 """

README.md

@@ -27,7 +27,7 @@ See the [documentation] for available functionality and examples.
 
 ## Rust version support
 
-The minimum supported Rust toolchain version is currently Rust 1.56.0.
+The minimum supported Rust toolchain version is currently Rust 1.64.0.
 
 Minor version updates may increase this version requirement. However, the
 previous two Rust releases will always be supported. If the minimum Rust

src/quote.rs

@@ -1,3 +1,4 @@
+use core::ffi::CStr;
 use core::fmt;
 use core::fmt::Write as _;
 
@@ -128,33 +129,24 @@ macro_rules! impl_with_deref {
     };
 }
 
+impl Quote for CStr {
+    #[inline]
+    fn escape(&self, f: &mut Formatter<'_>) -> Result {
+        self.to_bytes().escape(f)
+    }
+}
+
 #[cfg(feature = "alloc")]
 mod alloc {
+    use alloc::ffi::CString;
     use alloc::string::String;
     use alloc::vec::Vec;
 
-    impl_with_deref!(String, Vec<u8>);
+    impl_with_deref!(CString, String, Vec<u8>);
 }
 
 #[cfg(feature = "std")]
 mod std {
-    use std::ffi::CStr;
-    use std::ffi::CString;
-
-    use crate::Formatter;
-    use crate::Result;
-
-    use super::Quote;
-
-    impl Quote for CStr {
-        #[inline]
-        fn escape(&self, f: &mut Formatter<'_>) -> Result {
-            self.to_bytes().escape(f)
-        }
-    }
-
-    impl_with_deref!(CString);
-
     #[cfg(any(
         all(target_vendor = "fortanix", target_env = "sgx"),
         target_os = "hermit",