commit b8ebeb0e8406e3a8cb20795e1e90fdc43e9ce492
author David Tolnay <dtolnay@gmail.com> Sat Oct 31 23:52:06 2020 -0700
committer David Tolnay <dtolnay@gmail.com> Sat Oct 31 23:54:26 2020 -0700
tree 6a63f4c2e1992b9742fe43673b31dac1be8155a6
parent ace45fa9423735accfa303919d49461e7c0a075a

Fix fn arg representation to eliminate warning on rust 1.46+

macro/src/expand.rs

diff --git a/macro/src/expand.rs b/macro/src/expand.rs
index 1bcaa1e..b25d830 100644
--- a/macro/src/expand.rs
+++ b/macro/src/expand.rs
@@ -594,7 +594,7 @@
                 quote!(#receiver_type::#ident)
             }
         },
-        None => quote!(__extern),
+        None => quote!(::std::mem::transmute::<*const (), #sig>(__extern)),
     };
     call.extend(quote! { (#(#vars),*) });
 
@@ -662,7 +662,7 @@
     };
 
     let pointer = match invoke {
-        None => Some(quote!(__extern: #sig)),
+        None => Some(quote!(__extern: *const ())),
         Some(_) => None,
     };