diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index ed1a319..4b97a9e 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,6 +1,6 @@
 {
   "git": {
-    "sha1": "c1fba00e2ec717d22272d0922c6062e25181bff8"
+    "sha1": "6a13fce88235ebd11c0c67f419a3153dcd349eb9"
   },
   "path_in_vcs": ""
 }
\ No newline at end of file
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 531e97e..9443750 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,8 +12,13 @@
   RUSTFLAGS: -Dwarnings
 
 jobs:
+  pre_ci:
+    uses: dtolnay/.github/.github/workflows/pre_ci.yml@master
+
   test:
     name: Rust ${{matrix.rust}}
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -34,6 +39,8 @@
 
   msrv:
     name: Rust 1.39.0
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:
@@ -53,6 +60,8 @@
 
   miri:
     name: Miri
+    needs: pre_ci
+    if: needs.pre_ci.outputs.continue
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:
diff --git a/Android.bp b/Android.bp
index 4fcaa58..e9ff15b 100644
--- a/Android.bp
+++ b/Android.bp
@@ -41,7 +41,7 @@
     name: "libasync_trait",
     crate_name: "async_trait",
     cargo_env_compat: true,
-    cargo_pkg_version: "0.1.59",
+    cargo_pkg_version: "0.1.64",
     srcs: ["src/lib.rs"],
     edition: "2018",
     rustlibs: [
diff --git a/Cargo.toml b/Cargo.toml
index 9af1d7a..5a6efbe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@
 edition = "2018"
 rust-version = "1.39"
 name = "async-trait"
-version = "0.1.59"
+version = "0.1.64"
 authors = ["David Tolnay <dtolnay@gmail.com>"]
 description = "Type erasure for async trait methods"
 documentation = "https://docs.rs/async-trait"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 090eef9..2dd4171 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,6 +1,6 @@
 [package]
 name = "async-trait"
-version = "0.1.59"
+version = "0.1.64"
 authors = ["David Tolnay <dtolnay@gmail.com>"]
 categories = ["asynchronous", "no-std"]
 description = "Type erasure for async trait methods"
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
index 16fe87b..1b5ec8b 100644
--- a/LICENSE-APACHE
+++ b/LICENSE-APACHE
@@ -174,28 +174,3 @@
    of your accepting any such warranty or additional liability.
 
 END OF TERMS AND CONDITIONS
-
-APPENDIX: How to apply the Apache License to your work.
-
-   To apply the Apache License to your work, attach the following
-   boilerplate notice, with the fields enclosed by brackets "[]"
-   replaced with your own identifying information. (Don't include
-   the brackets!)  The text should be enclosed in the appropriate
-   comment syntax for the file format. We also recommend that a
-   file or class name and description of purpose be included on the
-   same "printed page" as the copyright notice for easier
-   identification within third-party archives.
-
-Copyright [yyyy] [name of copyright owner]
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-	http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
diff --git a/METADATA b/METADATA
index d8eed72..0445905 100644
--- a/METADATA
+++ b/METADATA
@@ -11,13 +11,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/async-trait/async-trait-0.1.59.crate"
+    value: "https://static.crates.io/crates/async-trait/async-trait-0.1.64.crate"
   }
-  version: "0.1.59"
+  version: "0.1.64"
   license_type: NOTICE
   last_upgrade_date {
-    year: 2022
-    month: 12
-    day: 6
+    year: 2023
+    month: 2
+    day: 1
   }
 }
diff --git a/README.md b/README.md
index 6ff8989..39e368b 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 [<img alt="github" src="https://img.shields.io/badge/github-dtolnay/async--trait-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/async-trait)
 [<img alt="crates.io" src="https://img.shields.io/crates/v/async-trait.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/async-trait)
 [<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-async--trait-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20">](https://docs.rs/async-trait)
-[<img alt="build status" src="https://img.shields.io/github/workflow/status/dtolnay/async-trait/CI/master?style=for-the-badge" height="20">](https://github.com/dtolnay/async-trait/actions?query=branch%3Amaster)
+[<img alt="build status" src="https://img.shields.io/github/actions/workflow/status/dtolnay/async-trait/ci.yml?branch=master&style=for-the-badge" height="20">](https://github.com/dtolnay/async-trait/actions?query=branch%3Amaster)
 
 The initial round of stabilizations for the async/await language feature in Rust
 1.39 did not include support for async fn in traits. Trying to include an async
diff --git a/build.rs b/build.rs
index fa2fe1c..d7f6b15 100644
--- a/build.rs
+++ b/build.rs
@@ -3,6 +3,8 @@
 use std::str;
 
 fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
+
     let compiler = match rustc_minor_version() {
         Some(compiler) => compiler,
         None => return,
diff --git a/src/expand.rs b/src/expand.rs
index 53918cb..88338db 100644
--- a/src/expand.rs
+++ b/src/expand.rs
@@ -80,7 +80,7 @@
             }
         }
         Item::Impl(input) => {
-            let mut lifetimes = CollectLifetimes::new("'impl", input.impl_token.span);
+            let mut lifetimes = CollectLifetimes::new("'impl");
             lifetimes.visit_type_mut(&mut *input.self_ty);
             lifetimes.visit_path_mut(&mut input.trait_.as_mut().unwrap().1);
             let params = &input.generics.params;
@@ -119,6 +119,7 @@
 fn lint_suppress_with_body() -> Attribute {
     parse_quote! {
         #[allow(
+            clippy::async_yields_async,
             clippy::let_unit_value,
             clippy::no_effect_underscore_binding,
             clippy::shadow_same,
@@ -166,7 +167,7 @@
         ReturnType::Type(arrow, ret) => (*arrow, quote!(#ret)),
     };
 
-    let mut lifetimes = CollectLifetimes::new("'life", default_span);
+    let mut lifetimes = CollectLifetimes::new("'life");
     for arg in sig.inputs.iter_mut() {
         match arg {
             FnArg::Receiver(arg) => lifetimes.visit_receiver_mut(arg),
@@ -297,10 +298,16 @@
             }) => {}
             FnArg::Receiver(arg) => arg.mutability = None,
             FnArg::Typed(arg) => {
-                if let Pat::Ident(ident) = &mut *arg.pat {
-                    ident.by_ref = None;
-                    ident.mutability = None;
-                } else {
+                let type_is_reference = match *arg.ty {
+                    Type::Reference(_) => true,
+                    _ => false,
+                };
+                if let Pat::Ident(pat) = &mut *arg.pat {
+                    if pat.ident == "self" || !type_is_reference {
+                        pat.by_ref = None;
+                        pat.mutability = None;
+                    }
+                } else if !type_is_reference {
                     let positional = positional_arg(i, &arg.pat);
                     let m = mut_pat(&mut arg.pat);
                     arg.pat = parse_quote!(#m #positional);
@@ -362,6 +369,12 @@
                 quote!(let #mutability #ident = #self_token;)
             }
             FnArg::Typed(arg) => {
+                // If there is a #[cfg(...)] attribute that selectively enables
+                // the parameter, forward it to the variable.
+                //
+                // This is currently not applied to the `self` parameter.
+                let attrs = arg.attrs.iter().filter(|attr| attr.path.is_ident("cfg"));
+
                 if let Pat::Ident(PatIdent {
                     ident, mutability, ..
                 }) = &*arg.pat
@@ -370,16 +383,32 @@
                         self_span = Some(ident.span());
                         let prefixed = Ident::new("__self", ident.span());
                         quote!(let #mutability #prefixed = #ident;)
+                    } else if let Type::Reference(_) = *arg.ty {
+                        quote!()
                     } else {
-                        quote!(let #mutability #ident = #ident;)
+                        quote! {
+                            #(#attrs)*
+                            let #mutability #ident = #ident;
+                        }
                     }
+                } else if let Type::Reference(_) = *arg.ty {
+                    quote!()
                 } else {
                     let pat = &arg.pat;
                     let ident = positional_arg(i, pat);
                     if let Pat::Wild(_) = **pat {
-                        quote!(let #ident = #ident;)
+                        quote! {
+                            #(#attrs)*
+                            let #ident = #ident;
+                        }
                     } else {
-                        quote!(let #pat = #ident;)
+                        quote! {
+                            #(#attrs)*
+                            let #pat = {
+                                let #ident = #ident;
+                                #ident
+                            };
+                        }
                     }
                 }
             }
diff --git a/src/lifetime.rs b/src/lifetime.rs
index 8e4ec38..86eac24 100644
--- a/src/lifetime.rs
+++ b/src/lifetime.rs
@@ -2,7 +2,7 @@
 use std::mem;
 use syn::visit_mut::{self, VisitMut};
 use syn::{
-    parse_quote_spanned, token, Expr, GenericArgument, Lifetime, Receiver, ReturnType, Type,
+    parse_quote_spanned, token, Expr, GenericArgument, Lifetime, Receiver, ReturnType, Token, Type,
     TypeBareFn, TypeImplTrait, TypeParen, TypePtr, TypeReference,
 };
 
@@ -10,22 +10,20 @@
     pub elided: Vec<Lifetime>,
     pub explicit: Vec<Lifetime>,
     pub name: &'static str,
-    pub default_span: Span,
 }
 
 impl CollectLifetimes {
-    pub fn new(name: &'static str, default_span: Span) -> Self {
+    pub fn new(name: &'static str) -> Self {
         CollectLifetimes {
             elided: Vec::new(),
             explicit: Vec::new(),
             name,
-            default_span,
         }
     }
 
-    fn visit_opt_lifetime(&mut self, lifetime: &mut Option<Lifetime>) {
+    fn visit_opt_lifetime(&mut self, reference: Token![&], lifetime: &mut Option<Lifetime>) {
         match lifetime {
-            None => *lifetime = Some(self.next_lifetime(None)),
+            None => *lifetime = Some(self.next_lifetime(reference.span)),
             Some(lifetime) => self.visit_lifetime(lifetime),
         }
     }
@@ -38,9 +36,8 @@
         }
     }
 
-    fn next_lifetime<S: Into<Option<Span>>>(&mut self, span: S) -> Lifetime {
+    fn next_lifetime(&mut self, span: Span) -> Lifetime {
         let name = format!("{}{}", self.name, self.elided.len());
-        let span = span.into().unwrap_or(self.default_span);
         let life = Lifetime::new(&name, span);
         self.elided.push(life.clone());
         life
@@ -49,13 +46,13 @@
 
 impl VisitMut for CollectLifetimes {
     fn visit_receiver_mut(&mut self, arg: &mut Receiver) {
-        if let Some((_, lifetime)) = &mut arg.reference {
-            self.visit_opt_lifetime(lifetime);
+        if let Some((reference, lifetime)) = &mut arg.reference {
+            self.visit_opt_lifetime(*reference, lifetime);
         }
     }
 
     fn visit_type_reference_mut(&mut self, ty: &mut TypeReference) {
-        self.visit_opt_lifetime(&mut ty.lifetime);
+        self.visit_opt_lifetime(ty.and_token, &mut ty.lifetime);
         visit_mut::visit_type_reference_mut(self, ty);
     }
 
diff --git a/tests/test.rs b/tests/test.rs
index 23d8f80..458904e 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -2,6 +2,7 @@
     async_trait_nightly_testing,
     feature(min_specialization, type_alias_impl_trait)
 )]
+#![deny(rust_2021_compatibility)]
 #![allow(
     clippy::let_unit_value,
     clippy::missing_panics_doc,
@@ -1461,3 +1462,125 @@
         async fn f(self: Arc<Self>) {}
     }
 }
+
+// https://github.com/dtolnay/async-trait/issues/226
+pub mod issue226 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Trait {
+        async fn cfg_param(&self, param: u8);
+        async fn cfg_param_wildcard(&self, _: u8);
+        async fn cfg_param_tuple(&self, (left, right): (u8, u8));
+    }
+
+    struct Struct;
+
+    #[async_trait]
+    impl Trait for Struct {
+        async fn cfg_param(&self, #[cfg(any())] param: u8, #[cfg(all())] _unused: u8) {}
+
+        async fn cfg_param_wildcard(&self, #[cfg(any())] _: u8, #[cfg(all())] _: u8) {}
+
+        async fn cfg_param_tuple(
+            &self,
+            #[cfg(any())] (left, right): (u8, u8),
+            #[cfg(all())] (_left, _right): (u8, u8),
+        ) {
+        }
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/232
+pub mod issue232 {
+    use async_trait::async_trait;
+
+    #[async_trait]
+    pub trait Generic<T> {
+        async fn take_ref(&self, thing: &T);
+    }
+
+    pub struct One;
+
+    #[async_trait]
+    impl<T> Generic<T> for One {
+        async fn take_ref(&self, _: &T) {}
+    }
+
+    pub struct Two;
+
+    #[async_trait]
+    impl<T: Sync> Generic<(T, T)> for Two {
+        async fn take_ref(&self, (a, b): &(T, T)) {
+            let _ = a;
+            let _ = b;
+        }
+    }
+
+    pub struct Three;
+
+    #[async_trait]
+    impl<T> Generic<(T, T, T)> for Three {
+        async fn take_ref(&self, (_a, _b, _c): &(T, T, T)) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/234
+pub mod issue234 {
+    use async_trait::async_trait;
+
+    pub struct Droppable;
+
+    impl Drop for Droppable {
+        fn drop(&mut self) {}
+    }
+
+    pub struct Tuple<T, U>(T, U);
+
+    #[async_trait]
+    pub trait Trait {
+        async fn f(arg: Tuple<Droppable, i32>);
+    }
+
+    pub struct UnderscorePattern;
+
+    #[async_trait]
+    impl Trait for UnderscorePattern {
+        async fn f(Tuple(_, _int): Tuple<Droppable, i32>) {}
+    }
+
+    pub struct DotDotPattern;
+
+    #[async_trait]
+    impl Trait for DotDotPattern {
+        async fn f(Tuple { 1: _int, .. }: Tuple<Droppable, i32>) {}
+    }
+}
+
+// https://github.com/dtolnay/async-trait/issues/236
+pub mod issue236 {
+    #![deny(clippy::async_yields_async)]
+    #![allow(clippy::manual_async_fn)]
+
+    use async_trait::async_trait;
+    use std::future::{self, Future, Ready};
+
+    // Does not trigger the lint.
+    pub async fn async_fn() -> Ready<()> {
+        future::ready(())
+    }
+
+    #[allow(clippy::async_yields_async)]
+    pub fn impl_future_fn() -> impl Future<Output = Ready<()>> {
+        async { future::ready(()) }
+    }
+
+    // The async_trait attribute turns the former into the latter, so we make it
+    // put its own allow(async_yeilds_async) to remain consistent with async fn.
+    #[async_trait]
+    pub trait Trait {
+        async fn f() -> Ready<()> {
+            future::ready(())
+        }
+    }
+}
diff --git a/tests/ui/lifetime-defined-here.rs b/tests/ui/lifetime-defined-here.rs
new file mode 100644
index 0000000..237cf66
--- /dev/null
+++ b/tests/ui/lifetime-defined-here.rs
@@ -0,0 +1,23 @@
+use async_trait::async_trait;
+
+#[async_trait]
+trait Foo {
+    async fn bar(&self, x: &str, y: &'_ str) -> &'static str;
+}
+
+struct S(String);
+
+#[async_trait]
+impl Foo for S {
+    async fn bar(&self, x: &str, y: &'_ str) -> &'static str {
+        if false {
+            &self.0
+        } else if false {
+            x
+        } else {
+            y
+        }
+    }
+}
+
+fn main() {}
diff --git a/tests/ui/lifetime-defined-here.stderr b/tests/ui/lifetime-defined-here.stderr
new file mode 100644
index 0000000..9ffef5b
--- /dev/null
+++ b/tests/ui/lifetime-defined-here.stderr
@@ -0,0 +1,29 @@
+error: lifetime may not live long enough
+  --> tests/ui/lifetime-defined-here.rs:12:49
+   |
+12 |     async fn bar(&self, x: &str, y: &'_ str) -> &'static str {
+   |                  -                              ^^^^^^^^^^^^ type annotation requires that `'life0` must outlive `'static`
+   |                  |
+   |                  lifetime `'life0` defined here
+
+error: lifetime may not live long enough
+  --> tests/ui/lifetime-defined-here.rs:12:49
+   |
+12 |     async fn bar(&self, x: &str, y: &'_ str) -> &'static str {
+   |                            -                    ^^^^^^^^^^^^ type annotation requires that `'life1` must outlive `'static`
+   |                            |
+   |                            lifetime `'life1` defined here
+
+error: lifetime may not live long enough
+  --> tests/ui/lifetime-defined-here.rs:12:49
+   |
+12 |     async fn bar(&self, x: &str, y: &'_ str) -> &'static str {
+   |                                      --         ^^^^^^^^^^^^ type annotation requires that `'life2` must outlive `'static`
+   |                                      |
+   |                                      lifetime `'life2` defined here
+
+help: the following changes may resolve your lifetime errors
+  |
+  = help: replace `'life0` with `'static`
+  = help: replace `'life1` with `'static`
+  = help: replace `'life2` with `'static`