Merge pull request #155 from dtolnay/items

Avoid items_after_statements lint in generated code

Author: dtolnay

src/expand.rs

@@ -359,17 +359,23 @@ fn transform_block(context: Context, sig: &mut Signature, block: &mut Block) {
     let stmts = &block.stmts;
     let let_ret = match &mut sig.output {
         ReturnType::Default => quote_spanned! {block.brace_token.span=>
-            let _: () = { #(#decls)* #(#stmts)* };
+            #(#decls)*
+            let _: () = { #(#stmts)* };
         },
         ReturnType::Type(_, ret) => {
             if contains_associated_type_impl_trait(context, ret) {
-                quote!(#(#decls)* #(#stmts)*)
+                if decls.is_empty() {
+                    quote!(#(#stmts)*)
+                } else {
+                    quote!(#(#decls)* { #(#stmts)* })
+                }
             } else {
                 quote_spanned! {block.brace_token.span=>
                     if let ::core::option::Option::Some(__ret) = ::core::option::Option::None::<#ret> {
                         return __ret;
                     }
-                    let __ret: #ret = { #(#decls)* #(#stmts)* };
+                    #(#decls)*
+                    let __ret: #ret = { #(#stmts)* };
                     #[allow(unreachable_code)]
                     __ret
                 }

tests/test.rs

@@ -1300,3 +1300,25 @@ pub mod issue152 {
         async fn f(&self) -> Self::Assoc {}
     }
 }
+
+// https://github.com/dtolnay/async-trait/issues/154
+pub mod issue154 {
+    #![deny(clippy::items_after_statements)]
+
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait MyTrait {
+        async fn f(&self);
+    }
+
+    pub struct Struct;
+
+    #[async_trait]
+    impl MyTrait for Struct {
+        async fn f(&self) {
+            const MAX: u16 = 128;
+            println!("{}", MAX);
+        }
+    }
+}