feat: add syntax macro + maintenance

.gitignore

@@ -1,2 +1 @@
 target
-/.vscode

Cargo.toml

@@ -1,15 +1,15 @@
 [package]
 name = "smallvec"
 version = "2.0.0-beta.3"
-edition = "2024"
-rust-version = "1.86"
-authors = ["The Servo Project Developers"]
-license = "MIT OR Apache-2.0"
-repository = "https://github.com/servo/rust-smallvec"
+edition.workspace = true
+rust-version.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
 description = "'Small vector' optimization: store up to a small number of items on the stack"
 keywords = ["small", "vec", "vector", "stack", "no_std"]
 categories = ["data-structures"]
-exclude = [".gitignore", "tests/", "fuzz/", "benches/", ".github/"]
+exclude = [".gitignore", "tests/", "fuzz/", "benches/", ".github/", "rustfmt.toml", ".vscode/"]
 
 [profile.bench]
 lto = "fat"
@@ -18,26 +18,20 @@ opt-level = 3
 debug = false
 strip = true
 
-# Dedicated profile for the iai-callgrind benchmarks. Callgrind needs the
-# function symbols in the binary to attribute event counts, so we disable
-# stripping (and keep debug info for line-level detail). Without symbols the
-# runner collects zero events for every benchmark. LTO is left on (inherited)
-# since it does not affect collection and keeps the run representative.
 [profile.callgrind]
 inherits = "bench"
-debug = 1
+debug = true
 strip = false
 
 [features]
 allocator-api = []
-allocator-api2 = ["dep:allocator-api2", "allocator-api"]
+allocator-api2 = ["allocator-api", "dep:allocator-api2"]
 internals = []
 proptest = ["dep:proptest", "std"]
-rayon = ["std", "dep:rayon"]
+rayon = ["dep:rayon", "std"]
 serde = ["dep:serde_core"]
 specialization = []
 std = []
-zeroize = ["dep:zeroize"]
 
 [dependencies]
 allocator-api2 = { version = "0.4", optional = true, features = [
@@ -58,12 +52,13 @@ proptest = { version = "1", optional = true, features = [
 ], default-features = false }
 rayon = { version = "1", optional = true, default-features = false }
 serde_core = { version = "1", optional = true, default-features = false }
+smallvec-macro = { version = "0.0.0", path = "./macro", default-features = false }
 zeroize = { version = "1", optional = true, default-features = false }
 
 [dev-dependencies]
 serde_test = "1"
 criterion = "0.8"
-iai-callgrind = "0.14"
+iai-callgrind = "0.16"
 
 [[test]]
 name = "arbitrary"
@@ -116,4 +111,13 @@ all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
 [workspace]
-members = [".", "fuzz"]
+package.edition = "2024"
+package.authors = ["The Servo Project Developers"]
+package.license = "MIT OR Apache-2.0"
+package.repository = "https://github.com/servo/rust-smallvec"
+package.rust-version = "1.86"
+resolver = "3"
+members = [
+    ".",
+    "fuzz"
+]

README.md

@@ -71,5 +71,6 @@ v.sort();
 > [!NOTE]
 >
 > - SmallVec without any features enabled does not make use of the standard library.
-> - The `rayon` feature implicitly requires `std`.
-> - The `allocator-api2` feature requires `allocator-api`
+> - The `rayon` and `proptest` features implicitly require `std`.
+> - The `allocator-api2` feature requires `allocator-api`, though it does not
+    require `nightly`

fuzz/Cargo.toml

@@ -1,9 +1,12 @@
 [package]
-name = "smallvec-fuzz"
+name = "fuzzer"
 version = "0.0.0"
-authors = ["The Servo Project Developers"]
+authors.workspace = true
+edition.workspace = true
+repository.workspace = true
+license.workspace = true
+description = "Fuzzer for SmallVec"
 publish = false
-edition = "2024"
 
 [package.metadata]
 cargo-fuzz = true

macro/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "smallvec-macro"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+description = "proc-macro crate for SmallVec"
+keywords = []
+categories = []
+
+[lib]
+proc-macro = true
+path = "./lib.rs"

macro/lib.rs

@@ -0,0 +1,30 @@
+use proc_macro::{
+    Delimiter,
+    TokenStream,
+    TokenTree
+};
+
+#[proc_macro_attribute]
+pub fn syntax(attribute: TokenStream, item: TokenStream) -> TokenStream {
+    let mut element = Vec::<TokenTree>::new();
+    let mut iterator = item.into_iter().fuse();
+    loop {
+        match [iterator.next(), iterator.next()] {
+            [
+                Some(TokenTree::Punct(punctuation)),
+                Some(TokenTree::Group(group))
+            ] if (punctuation.as_char(), group.delimiter()) == ('#', Delimiter::Bracket) => {
+                element.extend([punctuation.into(), group.into()]);
+            }
+            mut trees => {
+                element.extend(
+                    attribute
+                        .into_iter()
+                        .chain(trees.iter_mut().flat_map(Option::take))
+                        .chain(iterator)
+                );
+                return element.into_iter().collect();
+            }
+        };
+    }
+}

src/lib.rs

@@ -130,7 +130,8 @@ use {
             from_raw_parts_mut
         }
     },
-    newrange::NewRange
+    newrange::NewRange,
+    smallvec_macro::syntax
 };
 pub use {
     error::SmallVecError,
@@ -141,12 +142,7 @@ pub use {
         splice::Splice
     }
 };
-#[cfg(feature = "internals")]
-pub use {
-    locatedlength::LocatedLength,
-    rawsmallvec::RawSmallVec
-};
-#[cfg(not(feature = "internals"))]
+#[cfg_attr(feature = "internals", syntax(pub))]
 use {
     locatedlength::LocatedLength,
     rawsmallvec::RawSmallVec