Rename codegen proxy struct methods.

Also fixes codegen so that rustc emits a warning on unused catchers, as
with routes in the previous commit.

core/codegen/src/attribute/catch/mod.rs

@@ -61,9 +61,9 @@ pub fn _catch(
         /// Rocket code generated proxy structure.
         #vis struct #user_catcher_fn_name {  }
 
-        /// Rocket code generated proxy static conversion implementation.
-        impl From<#user_catcher_fn_name> for #_catcher::StaticInfo {
-            fn from(_: #user_catcher_fn_name) -> #_catcher::StaticInfo {
+        /// Rocket code generated proxy static conversion implementations.
+        impl #user_catcher_fn_name {
+            fn into_info(self) -> #_catcher::StaticInfo {
                 fn monomorphized_function<'_b>(
                     #__status: #Status,
                     #__req: &'_b #Request<'_>
@@ -83,13 +83,10 @@ pub fn _catch(
                     handler: monomorphized_function,
                 }
             }
-        }
 
-        /// Rocket code generated proxy conversion implementation.
-        impl From<#user_catcher_fn_name> for #Catcher {
-            #[inline]
-            fn from(_: #user_catcher_fn_name) -> #Catcher {
-                #_catcher::StaticInfo::from(#user_catcher_fn_name {}).into()
+            #[doc(hidden)]
+            pub fn into_catcher(self) -> #Catcher {
+                self.into_info().into()
             }
         }
     })

core/codegen/src/attribute/route/mod.rs

@@ -335,7 +335,7 @@ fn codegen_route(route: Route) -> Result<TokenStream> {
         /// Rocket code generated proxy structure.
         #vis struct #handler_fn_name {  }
 
-        /// Rocket code generated proxy static conversion implementation.
+        /// Rocket code generated proxy static conversion implementations.
         impl #handler_fn_name {
             #[allow(non_snake_case, unreachable_patterns, unreachable_code)]
             fn into_info(self) -> #_route::StaticInfo {
@@ -363,7 +363,9 @@ fn codegen_route(route: Route) -> Result<TokenStream> {
                     sentinels: #sentinels,
                 }
             }
-            pub fn into(self) -> #Route {
+
+            #[doc(hidden)]
+            pub fn into_route(self) -> #Route {
                 self.into_info().into()
             }
         }

core/codegen/src/bang/mod.rs

@@ -11,17 +11,20 @@ mod test_guide;
 fn struct_maker_vec(
     input: proc_macro::TokenStream,
     ty: TokenStream,
+    map: impl Fn(TokenStream) -> TokenStream,
 ) -> Result<TokenStream> {
     use crate::exports::_Vec;
 
     // Parse a comma-separated list of paths.
     let paths = <Punctuated<Path, Token![,]>>::parse_terminated.parse(input)?;
-    let exprs = paths.iter()
-        .map(|path| quote_spanned!(path.span() => {
+    let exprs = paths.iter().map(|path| {
+        let expr = map(quote_spanned!(path.span() => ___struct));
+        quote_spanned!(path.span() => {
             let ___struct = #path {};
-            let ___item: #ty = ___struct.into();
+            let ___item: #ty = #expr;
             ___item
-        }));
+        })
+    });
 
     Ok(quote!({
         let ___vec: #_Vec<#ty> = vec![#(#exprs),*];
@@ -30,12 +33,12 @@ fn struct_maker_vec(
 }
 
 pub fn routes_macro(input: proc_macro::TokenStream) -> TokenStream {
-    struct_maker_vec(input, quote!(::rocket::Route))
+    struct_maker_vec(input, quote!(::rocket::Route), |e| quote!(#e.into_route()))
         .unwrap_or_else(|diag| diag.emit_as_expr_tokens())
 }
 
 pub fn catchers_macro(input: proc_macro::TokenStream) -> TokenStream {
-    struct_maker_vec(input, quote!(::rocket::Catcher))
+    struct_maker_vec(input, quote!(::rocket::Catcher), |e| quote!(#e.into_catcher()))
         .unwrap_or_else(|diag| diag.emit_as_expr_tokens())
 }
 

examples/error-handling/src/main.rs

@@ -43,6 +43,7 @@ fn default_catcher(status: Status, req: &Request<'_>) -> status::Custom<String>
     status::Custom(status, msg)
 }
 
+#[allow(dead_code)]
 #[get("/unmanaged")]
 fn unmanaged(_u8: rocket::State<'_, u8>, _string: rocket::State<'_, String>) { }