Update various crates from edition 2018 to 2021.

(These will be updated to 2024 in a separate commit.)

The only change required is in a macro, where spaces are needed before
`#` to avoid a "prefixed identifiers and literals are reserved
since Rust 2021" error.

Author: nnethercote

crates/cuda_std/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "cuda_std"
 version = "0.2.2"
-edition = "2018"
+edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "Standard library for CUDA with rustc_codegen_nvvm"
 repository = "https://github.com/Rust-GPU/rust-cuda"

crates/cuda_std_macros/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "cuda_std_macros"
 version = "0.2.0"
-edition = "2018"
+edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "Macros for cuda_std"
 repository = "https://github.com/Rust-GPU/rust-cuda"

crates/cust_derive/Cargo.toml

@@ -2,7 +2,7 @@
 name = "cust_derive"
 version = "0.2.0"
 authors = ["Brook Heisler <[email protected]>", "Riccardo D'Ambrosio <[email protected]>"]
-edition = "2018"
+edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "Macros for cust"
 repository = "https://github.com/Rust-GPU/rust-cuda"

crates/cust_derive/src/lib.rs

@@ -53,11 +53,11 @@ fn impl_device_copy(input: &DeriveInput, import: TokenStream) -> TokenStream {
 
     // Finally, generate the unsafe impl and the type-checking function.
     let generated_code = quote! {
-        unsafe impl#impl_generics #import for #input_type#type_generics #where_clause {}
+        unsafe impl #impl_generics #import for #input_type #type_generics #where_clause {}
 
         #[doc(hidden)]
         #[allow(all)]
-        fn #type_test_func_ident#impl_generics(value: &#input_type#type_generics) #where_clause {
+        fn #type_test_func_ident #impl_generics(value: &#input_type #type_generics) #where_clause {
             fn assert_impl<T: #import>() {}
             #check_types_code
         }

crates/nvvm/Cargo.toml

@@ -2,7 +2,7 @@
 name = "nvvm"
 version = "0.1.1"
 authors = ["Riccardo D'Ambrosio <[email protected]>"]
-edition = "2018"
+edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "High level bindings to libnvvm"
 repository = "https://github.com/Rust-GPU/rust-cuda"

crates/optix/examples/path_tracer/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "path-tracer"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 glam = { version = "0.30", features = ["bytemuck", "cuda", "mint"] }

crates/optix/examples/path_tracer/kernels/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "path-tracer-kernels"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 cuda_std = { version = "0.2", path = "../../../../cuda_std" }

crates/ptx/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "ptx"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "PTX parser and analyzer"
 repository = "https://github.com/Rust-GPU/rust-cuda"