Don't make unstable-locales depend on alloc feature

Cargo.toml

@@ -25,7 +25,7 @@ std = ["alloc"]
 clock = ["std", "winapi", "iana-time-zone", "android-tzdata"]
 oldtime = []
 wasmbind = ["wasm-bindgen", "js-sys"]
-unstable-locales = ["pure-rust-locales", "alloc"]
+unstable-locales = ["pure-rust-locales"]
 __internal_bench = []
 
 [dependencies]

src/date.rs

@@ -14,7 +14,7 @@ use core::{fmt, hash};
 use rkyv::{Archive, Deserialize, Serialize};
 
 use crate::duration::Duration as OldDuration;
-#[cfg(feature = "unstable-locales")]
+#[cfg(all(feature = "unstable-locales", feature = "alloc"))]
 use crate::format::Locale;
 #[cfg(feature = "alloc")]
 use crate::format::{DelayedFormat, Item, StrftimeItems};
@@ -355,7 +355,7 @@ where
     }
 
     /// Formats the date with the specified formatting items and locale.
-    #[cfg(feature = "unstable-locales")]
+    #[cfg(all(feature = "unstable-locales", feature = "alloc"))]
     #[inline]
     #[must_use]
     pub fn format_localized_with_items<'a, I, B>(
@@ -379,7 +379,7 @@ where
     /// Formats the date with the specified format string and locale.
     /// See the [`crate::format::strftime`] module
     /// on the supported escape sequences.
-    #[cfg(feature = "unstable-locales")]
+    #[cfg(all(feature = "unstable-locales", feature = "alloc"))]
     #[inline]
     #[must_use]
     pub fn format_localized<'a>(

src/datetime/mod.rs

@@ -15,7 +15,7 @@ use core::{fmt, hash, str};
 use std::time::{SystemTime, UNIX_EPOCH};
 
 use crate::duration::Duration as OldDuration;
-#[cfg(feature = "unstable-locales")]
+#[cfg(all(feature = "unstable-locales", feature = "alloc"))]
 use crate::format::Locale;
 use crate::format::{
     parse, parse_and_remainder, parse_rfc3339, Fixed, Item, ParseError, ParseResult, Parsed,
@@ -891,7 +891,7 @@ where
     }
 
     /// Formats the combined date and time with the specified formatting items and locale.
-    #[cfg(feature = "unstable-locales")]
+    #[cfg(all(feature = "unstable-locales", feature = "alloc"))]
     #[inline]
     #[must_use]
     pub fn format_localized_with_items<'a, I, B>(
@@ -918,7 +918,7 @@ where
     ///
     /// See the [`crate::format::strftime`] module on the supported escape
     /// sequences.
-    #[cfg(feature = "unstable-locales")]
+    #[cfg(all(feature = "unstable-locales", feature = "alloc"))]
     #[inline]
     #[must_use]
     pub fn format_localized<'a>(

src/format/formatting.rs

@@ -22,10 +22,12 @@ use crate::{NaiveDate, NaiveTime, Weekday};
 
 #[cfg(feature = "alloc")]
 use super::locales;
+#[cfg(all(feature = "unstable-locales", feature = "alloc"))]
+use super::Locale;
 #[cfg(any(feature = "alloc", feature = "serde", feature = "rustc-serialize"))]
 use super::{Colons, OffsetFormat, OffsetPrecision, Pad};
 #[cfg(feature = "alloc")]
-use super::{Fixed, InternalFixed, InternalInternal, Item, Locale, Numeric};
+use super::{Fixed, InternalFixed, InternalInternal, Item, Numeric};
 #[cfg(feature = "alloc")]
 use locales::*;
 
@@ -188,7 +190,7 @@ pub fn format_item(
 
 /// Tries to format given arguments with given formatting items.
 /// Internally used by `DelayedFormat`.
-#[cfg(feature = "unstable-locales")]
+#[cfg(all(feature = "unstable-locales", feature = "alloc"))]
 #[deprecated(since = "0.4.32", note = "Use DelayedFormat::fmt instead")]
 pub fn format_localized<'a, I, B>(
     w: &mut fmt::Formatter,
@@ -213,7 +215,7 @@ where
 }
 
 /// Formats single formatting item
-#[cfg(feature = "unstable-locales")]
+#[cfg(all(feature = "unstable-locales", feature = "alloc"))]
 #[deprecated(since = "0.4.32", note = "Use DelayedFormat::fmt instead")]
 pub fn format_item_localized(
     w: &mut fmt::Formatter,

src/format/mod.rs

@@ -48,7 +48,9 @@ pub(crate) mod scan;
 
 pub mod strftime;
 
-#[cfg(feature = "alloc")]
+#[allow(unused)]
+// TODO: remove '#[allow(unused)]' once we use this module for parsing or something else that does
+// not require `alloc`.
 pub(crate) mod locales;
 
 pub(crate) use formatting::write_hundreds;
@@ -59,13 +61,11 @@ pub(crate) use formatting::write_rfc3339;
 #[cfg(feature = "alloc")]
 #[allow(deprecated)]
 pub use formatting::{format, format_item, DelayedFormat};
-#[cfg(feature = "unstable-locales")]
+#[cfg(all(feature = "unstable-locales", feature = "alloc"))]
 #[allow(deprecated)]
 pub use formatting::{format_item_localized, format_localized};
-#[cfg(all(feature = "unstable-locales", feature = "alloc"))]
+#[cfg(feature = "unstable-locales")]
 pub use locales::Locale;
-#[cfg(all(not(feature = "unstable-locales"), feature = "alloc"))]
-pub(crate) use locales::Locale;
 pub(crate) use parse::parse_rfc3339;
 pub use parse::{parse, parse_and_remainder};
 pub use parsed::Parsed;

src/lib.rs

@@ -227,7 +227,7 @@
 //! # #[allow(unused_imports)]
 //! use chrono::prelude::*;
 //!
-//! # #[cfg(feature = "unstable-locales")]
+//! # #[cfg(all(feature = "unstable-locales", feature = "alloc"))]
 //! # fn test() {
 //! let dt = Utc.with_ymd_and_hms(2014, 11, 28, 12, 0, 9).unwrap();
 //! assert_eq!(dt.format("%Y-%m-%d %H:%M:%S").to_string(), "2014-11-28 12:00:09");
@@ -244,9 +244,9 @@
 //! let dt_nano = NaiveDate::from_ymd_opt(2014, 11, 28).unwrap().and_hms_nano_opt(12, 0, 9, 1).unwrap().and_local_timezone(Utc).unwrap();
 //! assert_eq!(format!("{:?}", dt_nano), "2014-11-28T12:00:09.000000001Z");
 //! # }
-//! # #[cfg(not(feature = "unstable-locales"))]
+//! # #[cfg(not(all(feature = "unstable-locales", feature = "alloc")))]
 //! # fn test() {}
-//! # if cfg!(feature = "unstable-locales") {
+//! # if cfg!(all(feature = "unstable-locales", feature = "alloc")) {
 //! #    test();
 //! # }
 //! ```
@@ -489,7 +489,7 @@ pub mod prelude {
     #[cfg(feature = "clock")]
     #[doc(no_inline)]
     pub use crate::Local;
-    #[cfg(feature = "unstable-locales")]
+    #[cfg(all(feature = "unstable-locales", feature = "alloc"))]
     #[doc(no_inline)]
     pub use crate::Locale;
     #[doc(no_inline)]

src/naive/date.rs

@@ -13,7 +13,7 @@ use core::{fmt, str};
 use rkyv::{Archive, Deserialize, Serialize};
 
 /// L10n locales.
-#[cfg(feature = "unstable-locales")]
+#[cfg(all(feature = "unstable-locales", feature = "alloc"))]
 use pure_rust_locales::Locale;
 
 use crate::duration::Duration as OldDuration;
@@ -1319,7 +1319,7 @@ impl NaiveDate {
     }
 
     /// Formats the date with the specified formatting items and locale.
-    #[cfg(feature = "unstable-locales")]
+    #[cfg(all(feature = "unstable-locales", feature = "alloc"))]
     #[inline]
     #[must_use]
     pub fn format_localized_with_items<'a, I, B>(
@@ -1338,7 +1338,7 @@ impl NaiveDate {
     ///
     /// See the [`crate::format::strftime`] module on the supported escape
     /// sequences.
-    #[cfg(feature = "unstable-locales")]
+    #[cfg(all(feature = "unstable-locales", feature = "alloc"))]
     #[inline]
     #[must_use]
     pub fn format_localized<'a>(