Sketchy modification for $crate

Author: dtolnay

impl/src/lib.rs

@@ -22,7 +22,7 @@ pub fn hack_expr(input: TokenStream) -> TokenStream {
                     Input = (stringify!($($tt)*), 0).1
                 }}
 
-                proc_macro_call!()
+                proc_macro_call!($crate)
             }}}}
         }}
     ", attrs=hack.attrs, name=hack.name, name_impl=hack.name_impl);

src/lib.rs

@@ -304,11 +304,11 @@ macro_rules! proc_macro_expr_impl {
 
                 format!("
                     macro_rules! proc_macro_call {{
-                        () => {{
+                        ($proc_macro_hack_crate:tt) => {{
                             {}
                         }}
                     }}
-                ", func(tokens)).parse().unwrap()
+                ", func(tokens).replace("$crate", "$proc_macro_hack_crate")).parse().unwrap()
             }
         )+
     };