Rollup merge of rust-lang#62672 - lzutao:deprecated-try-macro, r=Centril

Deprecate `try!` macro

Replaces rust-lang#62077

Fixes rust-lang/rust-clippy#1361
Fixes rust-lang#61000

Author: Centril

src/libcore/macros.rs

@@ -302,6 +302,7 @@ macro_rules! debug_assert_ne {
 /// ```
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_deprecated(since = "1.39.0", reason = "use the `?` operator instead")]
 #[doc(alias = "?")]
 macro_rules! r#try {
     ($expr:expr) => (match $expr {

src/libstd/lib.rs

@@ -330,7 +330,11 @@ use prelude::v1::*;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::{assert_eq, assert_ne, debug_assert, debug_assert_eq, debug_assert_ne};
 #[stable(feature = "rust1", since = "1.0.0")]
-pub use core::{unreachable, unimplemented, write, writeln, r#try, todo};
+pub use core::{unreachable, unimplemented, write, writeln, todo};
+// FIXME: change this to `#[allow(deprecated)]` when we update nightly compiler.
+#[allow(deprecated_in_future)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub use core::r#try;
 
 #[allow(unused_imports)] // macros from `alloc` are not used on all platforms
 #[macro_use]

src/test/ui/associated-types/cache/chrono-scan.rs

@@ -1,5 +1,7 @@
 // check-pass
 
+#![allow(deprecated)]
+
 pub type ParseResult<T> = Result<T, ()>;
 
 pub enum Item<'a> {

src/test/ui/derived-errors/issue-31997.rs

@@ -1,5 +1,6 @@
 // Test that the resolve failure does not lead to downstream type errors.
 // See issue #31997.
+#![allow(deprecated)]
 
 trait TheTrait { }
 

src/test/ui/derived-errors/issue-31997.stderr

@@ -1,5 +1,5 @@
 error[E0425]: cannot find function `bar` in this scope
-  --> $DIR/issue-31997.rs:13:21
+  --> $DIR/issue-31997.rs:14:21
    |
 LL |     try!(closure(|| bar(core::ptr::null_mut())));
    |                     ^^^ not found in this scope

src/test/ui/lint/lint-qualification.rs

@@ -1,4 +1,5 @@
 #![deny(unused_qualifications)]
+#[allow(deprecated)]
 
 mod foo {
     pub fn bar() {}

src/test/ui/lint/lint-qualification.stderr

@@ -1,5 +1,5 @@
 error: unnecessary qualification
-  --> $DIR/lint-qualification.rs:9:5
+  --> $DIR/lint-qualification.rs:10:5
    |
 LL |     foo::bar();
    |     ^^^^^^^^

src/test/ui/macros/macro-comma-support-rpass.rs

@@ -15,6 +15,7 @@
 
 #![cfg_attr(core, no_std)]
 
+#![allow(deprecated)] // for deprecated `try!()` macro
 #![feature(concat_idents)]
 
 #[cfg(std)] use std::fmt;

src/test/ui/macros/try-macro.rs

@@ -1,4 +1,5 @@
 // run-pass
+#![allow(deprecated)] // for deprecated `try!()` macro
 use std::num::{ParseFloatError, ParseIntError};
 
 fn main() {

src/test/ui/rust-2018/try-macro.fixed

@@ -6,6 +6,7 @@
 #![warn(rust_2018_compatibility)]
 #![allow(unused_variables)]
 #![allow(dead_code)]
+#![allow(deprecated)]
 
 fn foo() -> Result<usize, ()> {
     let x: Result<usize, ()> = Ok(22);

src/test/ui/rust-2018/try-macro.rs

@@ -6,6 +6,7 @@
 #![warn(rust_2018_compatibility)]
 #![allow(unused_variables)]
 #![allow(dead_code)]
+#![allow(deprecated)]
 
 fn foo() -> Result<usize, ()> {
     let x: Result<usize, ()> = Ok(22);

src/test/ui/rust-2018/try-macro.stderr

@@ -1,5 +1,5 @@
 warning: `try` is a keyword in the 2018 edition
-  --> $DIR/try-macro.rs:12:5
+  --> $DIR/try-macro.rs:13:5
    |
 LL |     try!(x);
    |     ^^^ help: you can use a raw identifier to stay compatible: `r#try`