diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..28d7b30
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,5 @@
+{
+  "git": {
+    "sha1": "5feb37605c9ec2d237651dbd669e3527566a839e"
+  }
+}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6936990
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/target
+**/*.rs.bk
+Cargo.lock
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..da4d076
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,18 @@
+language: rust
+
+rust:
+  - 1.31.0
+  - stable
+  - beta
+  - nightly
+
+script: cargo test
+
+matrix:
+  include:
+    - rust: nightly
+      name: Minimal versions
+      before_script:
+        - cargo -Z minimal-versions generate-lockfile
+      script:
+        - cargo check --locked
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..5ad60cf
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,20 @@
+// This file is generated by cargo2android.py.
+
+rust_library_host_rlib {
+    name: "libpaste",
+    crate_name: "paste",
+    srcs: ["src/lib.rs"],
+    edition: "2018",
+    proc_macros: [
+        "libpaste_impl",
+        "libproc_macro_hack",
+    ],
+}
+
+// dependent_library ["feature_list"]
+//   paste-impl-0.1.7
+//   proc-macro-hack-0.5.11
+//   proc-macro2-1.0.9 "default,proc-macro"
+//   quote-1.0.3 "default,proc-macro"
+//   syn-1.0.16 "clone-impls,default,derive,parsing,printing,proc-macro,quote"
+//   unicode-xid-0.2.0 "default"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f9d3ead
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,35 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies
+#
+# If you believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+edition = "2018"
+name = "paste"
+version = "0.1.10"
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+description = "Macros for all your token pasting needs"
+readme = "README.md"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/dtolnay/paste"
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+[dependencies.paste-impl]
+version = "=0.1.10"
+
+[dependencies.proc-macro-hack]
+version = "0.5.9"
+[dev-dependencies.rustversion]
+version = "1.0"
+
+[dev-dependencies.trybuild]
+version = "1.0"
+[badges.travis-ci]
+repository = "dtolnay/paste"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..6f0d704
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,26 @@
+[package]
+name = "paste"
+version = "0.1.10"
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+edition = "2018"
+license = "MIT OR Apache-2.0"
+description = "Macros for all your token pasting needs"
+repository = "https://github.com/dtolnay/paste"
+readme = "README.md"
+
+[badges]
+travis-ci = { repository = "dtolnay/paste" }
+
+[dependencies]
+paste-impl = { version = "=0.1.10", path = "impl" }
+proc-macro-hack = "0.5.9"
+
+[dev-dependencies]
+rustversion = "1.0"
+trybuild = "1.0"
+
+[workspace]
+members = ["impl"]
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
diff --git a/LICENSE b/LICENSE
new file mode 120000
index 0000000..6b579aa
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1 @@
+LICENSE-APACHE
\ No newline at end of file
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..16fe87b
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+   "License" shall mean the terms and conditions for use, reproduction,
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+
+   "You" (or "Your") shall mean an individual or Legal Entity
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+   "Contribution" shall mean any work of authorship, including
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+   "Contributor" shall mean Licensor and any individual or Legal Entity
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+4. Redistribution. You may reproduce and distribute copies of the
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+
+   (c) You must retain, in the Source form of any Derivative Works
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+       notices within Derivative Works that You distribute, alongside
+       or as an addendum to the NOTICE text from the Work, provided
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+
+   You may add Your own copyright statement to Your modifications and
+   may provide additional or different license terms and conditions
+   for use, reproduction, or distribution of Your modifications, or
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+   reproduction, and distribution of the Work otherwise complies with
+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
+   except as required for reasonable and customary use in describing the
+   origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+   appropriateness of using or redistributing the Work and assume any
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+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
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+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
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+See the License for the specific language governing permissions and
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diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..815d6c0
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2018
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..bf81f11
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,19 @@
+name: "paste"
+description: "Macros for all your token pasting needs"
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://crates.io/crates/paste"
+  }
+  url {
+    type: GIT
+    value: "https://github.com/dtolnay/paste"
+  }
+  version: "0.1.10"
+  license_type: NOTICE
+  last_upgrade_date {
+    year: 2020
+    month: 4
+    day: 17
+  }
+}
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_APACHE2
diff --git a/NOTICE b/NOTICE
new file mode 120000
index 0000000..7a694c9
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1 @@
+LICENSE
\ No newline at end of file
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..46fc303
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+include platform/prebuilts/rust:/OWNERS
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4204dbe
--- /dev/null
+++ b/README.md
@@ -0,0 +1,153 @@
+Macros for all your token pasting needs
+=======================================
+
+[![Build Status](https://api.travis-ci.org/dtolnay/paste.svg?branch=master)](https://travis-ci.org/dtolnay/paste)
+[![Latest Version](https://img.shields.io/crates/v/paste.svg)](https://crates.io/crates/paste)
+[![Rust Documentation](https://img.shields.io/badge/api-rustdoc-blue.svg)](https://docs.rs/paste)
+
+The nightly-only [`concat_idents!`] macro in the Rust standard library is
+notoriously underpowered in that its concatenated identifiers can only refer to
+existing items, they can never be used to define something new.
+
+[`concat_idents!`]: https://doc.rust-lang.org/std/macro.concat_idents.html
+
+This crate provides a flexible way to paste together identifiers in a macro,
+including using pasted identifiers to define new items.
+
+```toml
+[dependencies]
+paste = "0.1"
+```
+
+This approach works with any stable or nightly Rust compiler 1.30+.
+
+<br>
+
+## Pasting identifiers
+
+There are two entry points, `paste::expr!` for macros in expression position and
+`paste::item!` for macros in item position.
+
+Within either one, identifiers inside `[<`...`>]` are pasted together to form a
+single identifier.
+
+```rust
+// Macro in item position: at module scope or inside of an impl block.
+paste::item! {
+    // Defines a const called `QRST`.
+    const [<Q R S T>]: &str = "success!";
+}
+
+fn main() {
+    // Macro in expression position: inside a function body.
+    assert_eq!(
+        paste::expr! { [<Q R S T>].len() },
+        8,
+    );
+}
+```
+
+<br>
+
+## More elaborate examples
+
+This program demonstrates how you may want to bundle a paste invocation inside
+of a more convenient user-facing macro of your own. Here the `routes!(A, B)`
+macro expands to a vector containing `ROUTE_A` and `ROUTE_B`.
+
+```rust
+const ROUTE_A: &str = "/a";
+const ROUTE_B: &str = "/b";
+
+macro_rules! routes {
+    ($($route:ident),*) => {{
+        paste::expr! {
+            vec![$( [<ROUTE_ $route>] ),*]
+        }
+    }}
+}
+
+fn main() {
+    let routes = routes!(A, B);
+    assert_eq!(routes, vec!["/a", "/b"]);
+}
+```
+
+The next example shows a macro that generates accessor methods for some struct
+fields.
+
+```rust
+macro_rules! make_a_struct_and_getters {
+    ($name:ident { $($field:ident),* }) => {
+        // Define a struct. This expands to:
+        //
+        //     pub struct S {
+        //         a: String,
+        //         b: String,
+        //         c: String,
+        //     }
+        pub struct $name {
+            $(
+                $field: String,
+            )*
+        }
+
+        // Build an impl block with getters. This expands to:
+        //
+        //     impl S {
+        //         pub fn get_a(&self) -> &str { &self.a }
+        //         pub fn get_b(&self) -> &str { &self.b }
+        //         pub fn get_c(&self) -> &str { &self.c }
+        //     }
+        paste::item! {
+            impl $name {
+                $(
+                    pub fn [<get_ $field>](&self) -> &str {
+                        &self.$field
+                    }
+                )*
+            }
+        }
+    }
+}
+
+make_a_struct_and_getters!(S { a, b, c });
+
+fn call_some_getters(s: &S) -> bool {
+    s.get_a() == s.get_b() && s.get_c().is_empty()
+}
+```
+
+<br>
+
+## Case conversion
+
+Use `$var:lower` or `$var:upper` in the segment list to convert an interpolated
+segment to lower- or uppercase as part of the paste. For example, `[<ld_
+$reg:lower _expr>]` would paste to `ld_bc_expr` if invoked with $reg=`Bc`.
+
+Use `$var:snake` to convert CamelCase input to snake\_case. These compose, so
+for example `$var:snake:upper` would give you SCREAMING\_CASE.
+
+The precise Unicode conversions are as defined by [`str::to_lowercase`] and
+[`str::to_uppercase`].
+
+[`str::to_lowercase`]: https://doc.rust-lang.org/std/primitive.str.html#method.to_lowercase
+[`str::to_uppercase`]: https://doc.rust-lang.org/std/primitive.str.html#method.to_uppercase
+
+<br>
+
+#### License
+
+<sup>
+Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
+2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
+</sup>
+
+<br>
+
+<sub>
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.
+</sub>
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..8125222
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,149 @@
+//! The nightly-only [`concat_idents!`] macro in the Rust standard library is
+//! notoriously underpowered in that its concatenated identifiers can only refer to
+//! existing items, they can never be used to define something new.
+//!
+//! [`concat_idents!`]: https://doc.rust-lang.org/std/macro.concat_idents.html
+//!
+//! This crate provides a flexible way to paste together identifiers in a macro,
+//! including using pasted identifiers to define new items.
+//!
+//! This approach works with any stable or nightly Rust compiler 1.30+.
+//!
+//! <br>
+//!
+//! # Pasting identifiers
+//!
+//! There are two entry points, `paste::expr!` for macros in expression position and
+//! `paste::item!` for macros in item position.
+//!
+//! Within either one, identifiers inside `[<`...`>]` are pasted together to form a
+//! single identifier.
+//!
+//! ```
+//! // Macro in item position: at module scope or inside of an impl block.
+//! paste::item! {
+//!     // Defines a const called `QRST`.
+//!     const [<Q R S T>]: &str = "success!";
+//! }
+//!
+//! fn main() {
+//!     // Macro in expression position: inside a function body.
+//!     assert_eq!(
+//!         paste::expr! { [<Q R S T>].len() },
+//!         8,
+//!     );
+//! }
+//! ```
+//!
+//! <br><br>
+//!
+//! # More elaborate examples
+//!
+//! This program demonstrates how you may want to bundle a paste invocation inside
+//! of a more convenient user-facing macro of your own. Here the `routes!(A, B)`
+//! macro expands to a vector containing `ROUTE_A` and `ROUTE_B`.
+//!
+//! ```
+//! const ROUTE_A: &str = "/a";
+//! const ROUTE_B: &str = "/b";
+//!
+//! macro_rules! routes {
+//!     ($($route:ident),*) => {{
+//!         paste::expr! {
+//!             vec![$( [<ROUTE_ $route>] ),*]
+//!         }
+//!     }}
+//! }
+//!
+//! fn main() {
+//!     let routes = routes!(A, B);
+//!     assert_eq!(routes, vec!["/a", "/b"]);
+//! }
+//! ```
+//!
+//! The next example shows a macro that generates accessor methods for some struct
+//! fields.
+//!
+//! ```
+//! macro_rules! make_a_struct_and_getters {
+//!     ($name:ident { $($field:ident),* }) => {
+//!         // Define a struct. This expands to:
+//!         //
+//!         //     pub struct S {
+//!         //         a: String,
+//!         //         b: String,
+//!         //         c: String,
+//!         //     }
+//!         pub struct $name {
+//!             $(
+//!                 $field: String,
+//!             )*
+//!         }
+//!
+//!         // Build an impl block with getters. This expands to:
+//!         //
+//!         //     impl S {
+//!         //         pub fn get_a(&self) -> &str { &self.a }
+//!         //         pub fn get_b(&self) -> &str { &self.b }
+//!         //         pub fn get_c(&self) -> &str { &self.c }
+//!         //     }
+//!         paste::item! {
+//!             impl $name {
+//!                 $(
+//!                     pub fn [<get_ $field>](&self) -> &str {
+//!                         &self.$field
+//!                     }
+//!                 )*
+//!             }
+//!         }
+//!     }
+//! }
+//!
+//! make_a_struct_and_getters!(S { a, b, c });
+//!
+//! fn call_some_getters(s: &S) -> bool {
+//!     s.get_a() == s.get_b() && s.get_c().is_empty()
+//! }
+//! #
+//! # fn main() {}
+//! ```
+//!
+//! <br><br>
+//!
+//! # Case conversion
+//!
+//! Use `$var:lower` or `$var:upper` in the segment list to convert an
+//! interpolated segment to lower- or uppercase as part of the paste. For
+//! example, `[<ld_ $reg:lower _expr>]` would paste to `ld_bc_expr` if invoked
+//! with $reg=`Bc`.
+//!
+//! Use `$var:snake` to convert CamelCase input to snake\_case. These compose,
+//! so for example `$var:snake:upper` would give you SCREAMING\_CASE.
+//!
+//! The precise Unicode conversions are as defined by [`str::to_lowercase`] and
+//! [`str::to_uppercase`].
+//!
+//! [`str::to_lowercase`]: https://doc.rust-lang.org/std/primitive.str.html#method.to_lowercase
+//! [`str::to_uppercase`]: https://doc.rust-lang.org/std/primitive.str.html#method.to_uppercase
+
+#![no_std]
+
+use proc_macro_hack::proc_macro_hack;
+
+/// Paste identifiers within a macro invocation that expands to an expression.
+#[proc_macro_hack]
+pub use paste_impl::expr;
+
+/// Paste identifiers within a macro invocation that expands to one or more
+/// items.
+///
+/// An item is like a struct definition, function, impl block, or anything else
+/// that can appear at the top level of a module scope.
+pub use paste_impl::item;
+
+/// Paste identifiers within a macro invocation that expands to one or more
+/// macro_rules macros or items containing macros.
+pub use paste_impl::item_with_macros;
+
+#[doc(hidden)]
+pub use paste_impl::EnumHack;
diff --git a/tests/compiletest.rs b/tests/compiletest.rs
new file mode 100644
index 0000000..f9aea23
--- /dev/null
+++ b/tests/compiletest.rs
@@ -0,0 +1,6 @@
+#[rustversion::attr(not(nightly), ignore)]
+#[test]
+fn ui() {
+    let t = trybuild::TestCases::new();
+    t.compile_fail("tests/ui/*.rs");
+}
diff --git a/tests/test.rs b/tests/test.rs
new file mode 100644
index 0000000..435eb71
--- /dev/null
+++ b/tests/test.rs
@@ -0,0 +1,257 @@
+mod test_basic {
+    struct Struct;
+
+    paste::item! {
+        impl Struct {
+            fn [<a b c>]() {}
+        }
+    }
+
+    #[test]
+    fn test() {
+        Struct::abc();
+    }
+}
+
+mod test_in_impl {
+    struct Struct;
+
+    impl Struct {
+        paste::item! {
+            fn [<a b c>]() {}
+        }
+    }
+
+    #[test]
+    fn test() {
+        Struct::abc();
+    }
+}
+
+#[test]
+fn test_shared_hygiene() {
+    paste::expr! {
+        let [<a a>] = 1;
+        assert_eq!([<a a>], 1);
+    }
+}
+
+#[test]
+fn test_repeat() {
+    const ROCKET_A: &'static str = "/a";
+    const ROCKET_B: &'static str = "/b";
+
+    macro_rules! routes {
+        ($($route:ident),*) => {{
+            paste::expr! {
+                vec![$( [<ROCKET_ $route>] ),*]
+            }
+        }}
+    }
+
+    let routes = routes!(A, B);
+    assert_eq!(routes, vec!["/a", "/b"]);
+}
+
+#[test]
+fn test_integer() {
+    const CONST0: &'static str = "const0";
+
+    let pasted = paste::expr!([<CONST 0>]);
+    assert_eq!(pasted, CONST0);
+}
+
+#[test]
+fn test_underscore() {
+    paste::expr! {
+        const A_B: usize = 0;
+        assert_eq!([<A _ B>], 0);
+    }
+}
+
+#[test]
+fn test_lifetime() {
+    paste::expr! {
+        #[allow(dead_code)]
+        struct S<[<'d e>]> {
+            q: &[<'d e>] str,
+        }
+    }
+}
+
+#[test]
+fn test_keyword() {
+    paste::expr! {
+        struct [<F move>];
+
+        let _ = Fmove;
+    }
+}
+
+#[test]
+fn test_literal_str() {
+    paste::expr! {
+        struct [<Foo "Bar-Baz">];
+
+        let _ = FooBar_Baz;
+    }
+}
+
+#[test]
+fn test_env_literal() {
+    paste::expr! {
+        struct [<Lib env bar>];
+
+        let _ = Libenvbar;
+    }
+}
+
+#[test]
+fn test_env_present() {
+    paste::expr! {
+        struct [<Lib env!("CARGO_PKG_NAME")>];
+
+        let _ = Libpaste;
+    }
+}
+
+#[test]
+fn test_raw_identifier() {
+    paste::expr! {
+        struct [<F r#move>];
+
+        let _ = Fmove;
+    }
+}
+
+#[test]
+fn test_false_start() {
+    trait Trait {
+        fn f() -> usize;
+    }
+
+    struct S;
+
+    impl Trait for S {
+        fn f() -> usize {
+            0
+        }
+    }
+
+    paste::expr! {
+        let x = [<S as Trait>::f()];
+        assert_eq!(x[0], 0);
+    }
+}
+
+#[test]
+fn test_local_variable() {
+    let yy = 0;
+
+    paste::expr! {
+        assert_eq!([<y y>], 0);
+    }
+}
+
+mod test_none_delimited_single_ident {
+    macro_rules! m {
+        ($id:ident) => {
+            paste::item! {
+                fn f() -> &'static str {
+                    stringify!($id)
+                }
+            }
+        };
+    }
+
+    m!(i32x4);
+
+    #[test]
+    fn test() {
+        assert_eq!(f(), "i32x4");
+    }
+}
+
+mod test_to_lower {
+    macro_rules! m {
+        ($id:ident) => {
+            paste::item! {
+                fn [<my_ $id:lower _here>](_arg: u8) -> &'static str {
+                    stringify!([<$id:lower>])
+                }
+            }
+        };
+    }
+
+    m!(Test);
+
+    #[test]
+    fn test_to_lower() {
+        assert_eq!(my_test_here(0), "test");
+    }
+}
+
+#[test]
+fn test_env_to_lower() {
+    paste::expr! {
+        struct [<Lib env!("CARGO_PKG_NAME"):lower>];
+
+        let _ = Libpaste;
+    }
+}
+
+mod test_to_upper {
+    macro_rules! m {
+        ($id:ident) => {
+            paste::item! {
+                const [<MY_ $id:upper _HERE>]: &str = stringify!([<$id:upper>]);
+            }
+        };
+    }
+
+    m!(Test);
+
+    #[test]
+    fn test_to_upper() {
+        assert_eq!(MY_TEST_HERE, "TEST");
+    }
+}
+
+#[test]
+fn test_env_to_upper() {
+    paste::expr! {
+        const [<LIB env!("CARGO_PKG_NAME"):upper>]: &str = "libpaste";
+
+        let _ = LIBPASTE;
+    }
+}
+
+mod test_to_snake {
+    macro_rules! m {
+        ($id:ident) => {
+            paste::item! {
+                const DEFAULT_SNAKE: &str = stringify!([<$id:snake>]);
+                const LOWER_SNAKE: &str = stringify!([<$id:snake:lower>]);
+                const UPPER_SNAKE: &str = stringify!([<$id:snake:upper>]);
+            }
+        };
+    }
+
+    m!(ThisIsButATest);
+
+    #[test]
+    fn test_to_snake() {
+        assert_eq!(DEFAULT_SNAKE, "this_is_but_a_test");
+        assert_eq!(LOWER_SNAKE, "this_is_but_a_test");
+        assert_eq!(UPPER_SNAKE, "THIS_IS_BUT_A_TEST");
+    }
+}
+
+#[test]
+fn test_env_to_snake() {
+    paste::expr! {
+        const [<LIB env!("CARGO_PKG_NAME"):snake:upper>]: &str = "libpaste";
+
+        let _ = LIBPASTE;
+    }
+}
diff --git a/tests/ui/case-warning.rs b/tests/ui/case-warning.rs
new file mode 100644
index 0000000..4b41ab6
--- /dev/null
+++ b/tests/ui/case-warning.rs
@@ -0,0 +1,13 @@
+#![deny(warnings)]
+
+macro_rules! m {
+    ($i:ident) => {
+        paste::item! {
+            pub fn [<foo $i>]() {}
+        }
+    };
+}
+
+m!(Bar);
+
+fn main() {}
diff --git a/tests/ui/case-warning.stderr b/tests/ui/case-warning.stderr
new file mode 100644
index 0000000..5bf37a0
--- /dev/null
+++ b/tests/ui/case-warning.stderr
@@ -0,0 +1,16 @@
+error: function `fooBar` should have a snake case name
+  --> $DIR/case-warning.rs:6:20
+   |
+6  |             pub fn [<foo $i>]() {}
+   |                    ^^^^^^^^^^ help: convert the identifier to snake case: `foo_bar`
+...
+11 | m!(Bar);
+   | -------- in this macro invocation
+   |
+note: the lint level is defined here
+  --> $DIR/case-warning.rs:1:9
+   |
+1  | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(non_snake_case)]` implied by `#[deny(warnings)]`
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/tests/ui/no-env-var.rs b/tests/ui/no-env-var.rs
new file mode 100644
index 0000000..87aad35
--- /dev/null
+++ b/tests/ui/no-env-var.rs
@@ -0,0 +1,5 @@
+paste::item! {
+    fn [<a env!("PASTE_UNKNOWN") b>]() {}
+}
+
+fn main() {}
diff --git a/tests/ui/no-env-var.stderr b/tests/ui/no-env-var.stderr
new file mode 100644
index 0000000..2ec206d
--- /dev/null
+++ b/tests/ui/no-env-var.stderr
@@ -0,0 +1,5 @@
+error: no such env var
+ --> $DIR/no-env-var.rs:2:17
+  |
+2 |     fn [<a env!("PASTE_UNKNOWN") b>]() {}
+  |                 ^^^^^^^^^^^^^^^
diff --git a/tests/ui/unexpected-modifier.rs b/tests/ui/unexpected-modifier.rs
new file mode 100644
index 0000000..00a1e99
--- /dev/null
+++ b/tests/ui/unexpected-modifier.rs
@@ -0,0 +1,5 @@
+paste::item! {
+    fn [<:lower x>]() {}
+}
+
+fn main() {}
diff --git a/tests/ui/unexpected-modifier.stderr b/tests/ui/unexpected-modifier.stderr
new file mode 100644
index 0000000..4a518b8
--- /dev/null
+++ b/tests/ui/unexpected-modifier.stderr
@@ -0,0 +1,5 @@
+error: unexpected modifier
+ --> $DIR/unexpected-modifier.rs:2:10
+  |
+2 |     fn [<:lower x>]() {}
+  |          ^^^^^^
diff --git a/tests/ui/unsupported-modifier.rs b/tests/ui/unsupported-modifier.rs
new file mode 100644
index 0000000..5ab049f
--- /dev/null
+++ b/tests/ui/unsupported-modifier.rs
@@ -0,0 +1,5 @@
+paste::item! {
+    fn [<a:pillow>]() {}
+}
+
+fn main() {}
diff --git a/tests/ui/unsupported-modifier.stderr b/tests/ui/unsupported-modifier.stderr
new file mode 100644
index 0000000..ffbc742
--- /dev/null
+++ b/tests/ui/unsupported-modifier.stderr
@@ -0,0 +1,5 @@
+error: unsupported modifier
+ --> $DIR/unsupported-modifier.rs:2:11
+  |
+2 |     fn [<a:pillow>]() {}
+  |           ^^^^^^^