1 files changed, 0 insertions, 143 deletions
diff --git a/syn/examples/lazy-static/lazy-static/src/lib.rs b/syn/examples/lazy-static/lazy-static/src/lib.rs
deleted file mode 100644
index 254ca72..0000000
--- a/syn/examples/lazy-static/lazy-static/src/lib.rs
+++ /dev/null
@@ -1,143 +0,0 @@
-#![recursion_limit = "128"]
-#![feature(proc_macro_diagnostic)]
-
-extern crate proc_macro;
-use self::proc_macro::TokenStream;
-
-use quote::{quote, quote_spanned};
-use syn::parse::{Parse, ParseStream, Result};
-use syn::spanned::Spanned;
-use syn::{parse_macro_input, Expr, Ident, Token, Type, Visibility};
-
-/// Parses the following syntax, which aligns with the input of the real
-/// `lazy_static` crate.
-///
-///     lazy_static! {
-///         $VISIBILITY static ref $NAME: $TYPE = $EXPR;
-///     }
-///
-/// For example:
-///
-///     lazy_static! {
-///         static ref USERNAME: Regex = Regex::new("^[a-z0-9_-]{3,16}$").unwrap();
-///     }
-struct LazyStatic {
-    visibility: Visibility,
-    name: Ident,
-    ty: Type,
-    init: Expr,
-}
-
-impl Parse for LazyStatic {
-    fn parse(input: ParseStream) -> Result<Self> {
-        let visibility: Visibility = input.parse()?;
-        input.parse::<Token![static]>()?;
-        input.parse::<Token![ref]>()?;
-        let name: Ident = input.parse()?;
-        input.parse::<Token![:]>()?;
-        let ty: Type = input.parse()?;
-        input.parse::<Token![=]>()?;
-        let init: Expr = input.parse()?;
-        input.parse::<Token![;]>()?;
-        Ok(LazyStatic {
-            visibility,
-            name,
-            ty,
-            init,
-        })
-    }
-}
-
-#[proc_macro]
-pub fn lazy_static(input: TokenStream) -> TokenStream {
-    let LazyStatic {
-        visibility,
-        name,
-        ty,
-        init,
-    } = parse_macro_input!(input as LazyStatic);
-
-    // The warning looks like this.
-    //
-    //     warning: come on, pick a more creative name
-    //       --> src/main.rs:10:16
-    //        |
-    //     10 |     static ref FOO: String = "lazy_static".to_owned();
-    //        |                ^^^
-    if name == "FOO" {
-        name.span()
-            .unwrap()
-            .warning("come on, pick a more creative name")
-            .emit();
-    }
-
-    // The error looks like this.
-    //
-    //     error: I can't think of a legitimate use for lazily initializing the value `()`
-    //       --> src/main.rs:10:27
-    //        |
-    //     10 |     static ref UNIT: () = ();
-    //        |                           ^^
-    if let Expr::Tuple(ref init) = init {
-        if init.elems.is_empty() {
-            init.span()
-                .unwrap()
-                .error("I can't think of a legitimate use for lazily initializing the value `()`")
-                .emit();
-            return TokenStream::new();
-        }
-    }
-
-    // Assert that the static type implements Sync. If not, user sees an error
-    // message like the following. We span this assertion with the field type's
-    // line/column so that the error message appears in the correct place.
-    //
-    //     error[E0277]: the trait bound `*const (): std::marker::Sync` is not satisfied
-    //       --> src/main.rs:10:21
-    //        |
-    //     10 |     static ref PTR: *const () = &();
-    //        |                     ^^^^^^^^^ `*const ()` cannot be shared between threads safely
-    let assert_sync = quote_spanned! {ty.span()=>
-        struct _AssertSync where #ty: std::marker::Sync;
-    };
-
-    // Check for Sized. Not vital to check here, but the error message is less
-    // confusing this way than if they get a Sized error in one of our
-    // implementation details where it assumes Sized.
-    //
-    //     error[E0277]: the trait bound `str: std::marker::Sized` is not satisfied
-    //       --> src/main.rs:10:19
-    //        |
-    //     10 |     static ref A: str = "";
-    //        |                   ^^^ `str` does not have a constant size known at compile-time
-    let assert_sized = quote_spanned! {ty.span()=>
-        struct _AssertSized where #ty: std::marker::Sized;
-    };
-
-    let init_ptr = quote_spanned! {init.span()=>
-        Box::into_raw(Box::new(#init))
-    };
-
-    let expanded = quote! {
-        #visibility struct #name;
-
-        impl std::ops::Deref for #name {
-            type Target = #ty;
-
-            fn deref(&self) -> &#ty {
-                #assert_sync
-                #assert_sized
-
-                static ONCE: std::sync::Once = std::sync::Once::new();
-                static mut VALUE: *mut #ty = 0 as *mut #ty;
-
-                unsafe {
-                    ONCE.call_once(|| VALUE = #init_ptr);
-                    &*VALUE
-                }
-            }
-        }
-    };
-
-    TokenStream::from(expanded)
-}