Set edition to 2021 for all crates

library/compiler-builtins/libm/Cargo.toml

@@ -9,7 +9,7 @@ name = "libm"
 readme = "README.md"
 repository = "https://github.com/rust-lang/libm"
 version = "0.2.8"
-edition = "2018"
+edition = "2021"
 exclude = ["/ci/", "/.github/workflows/"]
 
 [features]

library/compiler-builtins/libm/crates/compiler-builtins-smoke-test/Cargo.toml

@@ -2,6 +2,7 @@
 name = "cb"
 version = "0.1.0"
 authors = ["Jorge Aparicio <jorge@japaric.io>"]
+edition = "2021"
 
 [lib]
 test = false

library/compiler-builtins/libm/crates/compiler-builtins-smoke-test/src/lib.rs

@@ -2,6 +2,8 @@
 //!
 //! This is used to test that we can source import `libm` into the compiler-builtins crate.
 
+#![feature(core_intrinsics)]
+#![allow(internal_features)]
 #![allow(dead_code)]
 #![no_std]
 

library/compiler-builtins/libm/crates/libm-bench/Cargo.toml

@@ -2,7 +2,7 @@
 name = "libm-bench"
 version = "0.1.0"
 authors = ["Gonzalo Brito Gadeschi <gonzalobg88@gmail.com>"]
-edition = "2018"
+edition = "2021"
 license = "MIT OR Apache-2.0"
 
 [dependencies]