Stabilize a portion of 'once_cell'

Move items not part of this stabilization to 'lazy_cell' or 'once_cell_try'

Author: tgross35

clippy_dev/src/lib.rs

@@ -1,5 +1,4 @@
 #![feature(let_chains)]
-#![feature(once_cell)]
 #![feature(rustc_private)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 // warn on lints, that are included in `rust-lang/rust`s bootstrap

clippy_lints/src/lib.rs

@@ -7,7 +7,6 @@
 #![feature(let_chains)]
 #![feature(lint_reasons)]
 #![feature(never_type)]
-#![feature(once_cell)]
 #![feature(rustc_private)]
 #![feature(stmt_expr_attributes)]
 #![recursion_limit = "512"]

clippy_utils/src/lib.rs

@@ -3,7 +3,6 @@
 #![feature(let_chains)]
 #![feature(lint_reasons)]
 #![feature(never_type)]
-#![feature(once_cell)]
 #![feature(rustc_private)]
 #![recursion_limit = "512"]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]

src/driver.rs

@@ -1,6 +1,6 @@
 #![feature(rustc_private)]
 #![feature(let_chains)]
-#![feature(once_cell)]
+#![feature(lazy_cell)]
 #![feature(lint_reasons)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 // warn on lints, that are included in `rust-lang/rust`s bootstrap

tests/compile-test.rs

@@ -1,5 +1,5 @@
 #![feature(test)] // compiletest_rs requires this attribute
-#![feature(once_cell)]
+#![feature(lazy_cell)]
 #![feature(is_sorted)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 #![warn(rust_2018_idioms, unused_lifetimes)]

tests/dogfood.rs

@@ -3,7 +3,7 @@
 //!
 //! See [Eating your own dog food](https://en.wikipedia.org/wiki/Eating_your_own_dog_food) for context
 
-#![feature(once_cell)]
+#![feature(lazy_cell)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 #![warn(rust_2018_idioms, unused_lifetimes)]
 

tests/lint_message_convention.rs

@@ -1,4 +1,4 @@
-#![feature(once_cell)]
+#![feature(lazy_cell)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 #![warn(rust_2018_idioms, unused_lifetimes)]
 

tests/workspace.rs

@@ -1,4 +1,4 @@
-#![feature(once_cell)]
+#![feature(lazy_cell)]
 
 use std::path::PathBuf;
 use std::process::Command;