Use panic() instead of panic!() in some places in core.

Author: m-ou-se

core/src/lib.rs

@@ -141,6 +141,7 @@
 #![feature(const_type_id)]
 #![feature(const_type_name)]
 #![feature(const_default_impls)]
+#![feature(core_panic)]
 #![feature(duration_consts_float)]
 #![feature(maybe_uninit_uninit_array)]
 #![feature(ptr_metadata)]

core/src/macros/mod.rs

@@ -589,9 +589,10 @@ macro_rules! writeln {
 /// ```
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[allow_internal_unstable(core_panic)]
 macro_rules! unreachable {
     () => ({
-        $crate::panic!("internal error: entered unreachable code")
+        $crate::panicking::panic("internal error: entered unreachable code")
     });
     ($msg:expr $(,)?) => ({
         $crate::unreachable!("{}", $msg)
@@ -674,8 +675,9 @@ macro_rules! unreachable {
 /// ```
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[allow_internal_unstable(core_panic)]
 macro_rules! unimplemented {
-    () => ($crate::panic!("not implemented"));
+    () => ($crate::panicking::panic("not implemented"));
     ($($arg:tt)+) => ($crate::panic!("not implemented: {}", $crate::format_args!($($arg)+)));
 }
 
@@ -735,8 +737,9 @@ macro_rules! unimplemented {
 /// ```
 #[macro_export]
 #[stable(feature = "todo_macro", since = "1.40.0")]
+#[allow_internal_unstable(core_panic)]
 macro_rules! todo {
-    () => ($crate::panic!("not yet implemented"));
+    () => ($crate::panicking::panic("not yet implemented"));
     ($($arg:tt)+) => ($crate::panic!("not yet implemented: {}", $crate::format_args!($($arg)+)));
 }
 

core/src/option.rs

@@ -501,6 +501,7 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 use crate::iter::{FromIterator, FusedIterator, TrustedLen};
+use crate::panicking::{panic, panic_str};
 use crate::pin::Pin;
 use crate::{
     convert, hint, mem,
@@ -755,7 +756,7 @@ impl<T> Option<T> {
     pub const fn unwrap(self) -> T {
         match self {
             Some(val) => val,
-            None => panic!("called `Option::unwrap()` on a `None` value"),
+            None => panic("called `Option::unwrap()` on a `None` value"),
         }
     }
 
@@ -1815,8 +1816,9 @@ impl<T, E> Option<Result<T, E>> {
 #[cfg_attr(feature = "panic_immediate_abort", inline)]
 #[cold]
 #[track_caller]
+#[rustc_const_unstable(feature = "const_option", issue = "67441")]
 const fn expect_failed(msg: &str) -> ! {
-    panic!("{}", msg)
+    panic_str(msg)
 }
 
 /////////////////////////////////////////////////////////////////////////////