Use the linkme shorthand for function elements

It is a new feature available in linkme 0.2.1.
So the linkme version requirement is bumped up to 0.2.1.

Author: dynaxis

Cargo.toml

@@ -12,7 +12,7 @@ keywords = ["trait", "cast", "any"]
 
 [dependencies]
 once_cell = "1.3.1"
-linkme = "0.1.6"
+linkme = "0.2.1"
 intertrait-macros = { version = "=0.1.0", path = "macros" }
 
 [dev-dependencies]

macros/src/gen_caster.rs

@@ -10,15 +10,11 @@ use quote::quote;
 use quote::ToTokens;
 
 pub fn generate_caster(ty: &impl ToTokens, trait_: &Path) -> TokenStream {
-    let mut static_buf = [0u8; STATIC_BUF_LEN];
-    let static_var = format_ident!("{}", generate_static(&mut static_buf));
     let mut fn_buf = [0u8; FN_BUF_LEN];
     let fn_ident = format_ident!("{}", generate_fn(&mut fn_buf));
 
     quote! {
         #[linkme::distributed_slice(intertrait::CASTERS)]
-        static #static_var: fn() -> (std::any::TypeId, intertrait::BoxedCaster) = #fn_ident;
-
         fn #fn_ident() -> (std::any::TypeId, intertrait::BoxedCaster) {
             let type_id = std::any::TypeId::of::<#ty>();
             let caster = Box::new(intertrait::Caster::<dyn #trait_> {
@@ -31,20 +27,9 @@ pub fn generate_caster(ty: &impl ToTokens, trait_: &Path) -> TokenStream {
     }
 }
 
-const STATIC_PREFIX: &[u8] = b"__";
-const STATIC_BUF_LEN: usize = STATIC_PREFIX.len() + Simple::LENGTH;
-
 const FN_PREFIX: &[u8] = b"__";
 const FN_BUF_LEN: usize = FN_PREFIX.len() + Simple::LENGTH;
 
-fn generate_static(buf: &mut [u8]) -> &str {
-    buf[..STATIC_PREFIX.len()].copy_from_slice(STATIC_PREFIX);
-    Uuid::new_v4()
-        .to_simple()
-        .encode_upper(&mut buf[STATIC_PREFIX.len()..]);
-    unsafe { from_utf8_unchecked(&buf[..STATIC_BUF_LEN]) }
-}
-
 fn generate_fn(buf: &mut [u8]) -> &str {
     buf[..FN_PREFIX.len()].copy_from_slice(FN_PREFIX);
     Uuid::new_v4()