Merge pull request #240 from artichoke/lopopolo/test-auto-traits

Fix v1.9.0 regression where `SymbolTable` is no longer `Send`

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "intaglio"
-version = "1.9.0" # remember to set `html_root_url` in `src/lib.rs`.
+version = "1.9.1" # remember to set `html_root_url` in `src/lib.rs`.
 authors = ["Ryan Lopopolo <rjl@hyperbo.la>"]
 license = "MIT"
 edition = "2021"

README.md

@@ -36,7 +36,7 @@ Add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-intaglio = "1.9.0"
+intaglio = "1.9.1"
 ```
 
 Then intern UTF-8 strings like:

src/internal.rs

@@ -425,6 +425,22 @@ mod boxed {
         }
     }
 
+    // SAFETY: `PinBox` acts like `Box`.
+    unsafe impl<T> Send for PinBox<T>
+    where
+        T: ?Sized,
+        Box<T>: Send,
+    {
+    }
+
+    // SAFETY: `PinBox` acts like `Box`.
+    unsafe impl<T> Sync for PinBox<T>
+    where
+        T: ?Sized,
+        Box<T>: Sync,
+    {
+    }
+
     #[cfg(test)]
     mod tests {
         use core::fmt::Write;

src/lib.rs

@@ -109,7 +109,7 @@
 //! [`&Path`]: std::path::Path
 //! [`&'static Path`]: std::path::Path
 
-#![doc(html_root_url = "https://docs.rs/intaglio/1.9.0")]
+#![doc(html_root_url = "https://docs.rs/intaglio/1.9.1")]
 
 use core::fmt;
 use core::num::TryFromIntError;
@@ -272,6 +272,8 @@ mod tests {
     use core::cmp::Ordering;
     use core::fmt::Write as _;
     use core::hash::{BuildHasher as _, Hash as _, Hasher as _};
+    use core::marker::Unpin;
+    use core::panic::{RefUnwindSafe, UnwindSafe};
     use std::collections::hash_map::RandomState;
 
     use super::SymbolOverflowError;
@@ -357,6 +359,21 @@ mod tests {
 
         assert_eq!(default_hash, new_hash);
     }
+
+    #[test]
+    fn auto_traits_are_implemented() {
+        fn constraint<T: RefUnwindSafe + Send + Sync + Unpin + UnwindSafe>(_table: T) {}
+
+        constraint(crate::SymbolTable::with_capacity(0));
+        #[cfg(feature = "bytes")]
+        constraint(crate::bytes::SymbolTable::with_capacity(0));
+        #[cfg(feature = "cstr")]
+        constraint(crate::cstr::SymbolTable::with_capacity(0));
+        #[cfg(feature = "osstr")]
+        constraint(crate::osstr::SymbolTable::with_capacity(0));
+        #[cfg(feature = "path")]
+        constraint(crate::path::SymbolTable::with_capacity(0));
+    }
 }
 
 // Ensure code blocks in `README.md` compile