1 //! Panic support in the standard library.
3 #![stable(feature = "core_panic_info", since = "1.41.0")]
11 #[stable(feature = "panic_hooks", since = "1.10.0")]
12 pub use self::location::Location;
13 #[stable(feature = "panic_hooks", since = "1.10.0")]
14 pub use self::panic_info::PanicInfo;
15 #[stable(feature = "catch_unwind", since = "1.9.0")]
16 pub use self::unwind_safe::{AssertUnwindSafe, RefUnwindSafe, UnwindSafe};
19 #[unstable(feature = "edition_panic", issue = "none", reason = "use panic!() instead")]
20 #[allow_internal_unstable(core_panic, const_format_args)]
21 #[rustc_diagnostic_item = "core_panic_2015_macro"]
22 #[rustc_macro_transparency = "semitransparent"]
23 pub macro panic_2015 {
25 $crate::panicking::panic("explicit panic")
27 ($msg:literal $(,)?) => (
28 $crate::panicking::panic($msg)
30 // Use `panic_str` instead of `panic_display::<&str>` for non_fmt_panic lint.
31 ($msg:expr $(,)?) => (
32 $crate::panicking::panic_str($msg)
34 // Special-case the single-argument case for const_panic.
35 ("{}", $arg:expr $(,)?) => (
36 $crate::panicking::panic_display(&$arg)
38 ($fmt:expr, $($arg:tt)+) => (
39 $crate::panicking::panic_fmt($crate::const_format_args!($fmt, $($arg)+))
44 #[unstable(feature = "edition_panic", issue = "none", reason = "use panic!() instead")]
45 #[allow_internal_unstable(core_panic, const_format_args)]
46 #[rustc_diagnostic_item = "core_panic_2021_macro"]
47 #[rustc_macro_transparency = "semitransparent"]
48 pub macro panic_2021 {
50 $crate::panicking::panic("explicit panic")
52 // Special-case the single-argument case for const_panic.
53 ("{}", $arg:expr $(,)?) => (
54 $crate::panicking::panic_display(&$arg)
57 $crate::panicking::panic_fmt($crate::const_format_args!($($t)+))
62 #[unstable(feature = "edition_panic", issue = "none", reason = "use unreachable!() instead")]
63 #[allow_internal_unstable(core_panic)]
64 #[rustc_diagnostic_item = "unreachable_2015_macro"]
65 #[rustc_macro_transparency = "semitransparent"]
66 pub macro unreachable_2015 {
68 $crate::panicking::panic("internal error: entered unreachable code")
70 // Use of `unreachable_display` for non_fmt_panic lint.
71 // NOTE: the message ("internal error ...") is embedded directly in unreachable_display
72 ($msg:expr $(,)?) => (
73 $crate::panicking::unreachable_display(&$msg)
75 ($fmt:expr, $($arg:tt)*) => (
76 $crate::panic!($crate::concat!("internal error: entered unreachable code: ", $fmt), $($arg)*)
81 #[unstable(feature = "edition_panic", issue = "none", reason = "use unreachable!() instead")]
82 #[allow_internal_unstable(core_panic)]
83 #[rustc_macro_transparency = "semitransparent"]
84 pub macro unreachable_2021 {
86 $crate::panicking::panic("internal error: entered unreachable code")
89 $crate::panic!("internal error: entered unreachable code: {}", $crate::format_args!($($t)+))
93 /// An internal trait used by libstd to pass data from libstd to `panic_unwind`
94 /// and other panic runtimes. Not intended to be stabilized any time soon, do
96 #[unstable(feature = "std_internals", issue = "none")]
98 pub unsafe trait BoxMeUp {
99 /// Take full ownership of the contents.
100 /// The return type is actually `Box<dyn Any + Send>`, but we cannot use `Box` in libcore.
102 /// After this method got called, only some dummy default value is left in `self`.
103 /// Calling this method twice, or calling `get` after calling this method, is an error.
105 /// The argument is borrowed because the panic runtime (`__rust_start_panic`) only
106 /// gets a borrowed `dyn BoxMeUp`.
107 fn take_box(&mut self) -> *mut (dyn Any + Send);
109 /// Just borrow the contents.
110 fn get(&mut self) -> &(dyn Any + Send);