@@ -155,56 +155,64 @@ pub const fn panic(expr: &'static str) -> ! {
155155// reducing binary size impact.
156156macro_rules! panic_const {
157157 ( $( $lang: ident = $message: expr, ) +) => {
158- pub mod panic_const {
159- use super :: * ;
160-
161- $(
162- /// This is a panic called with a message that's a result of a MIR-produced Assert.
163- //
164- // never inline unless panic_immediate_abort to avoid code
165- // bloat at the call sites as much as possible
166- #[ cfg_attr( not( feature = "panic_immediate_abort" ) , inline( never) , cold) ]
167- #[ cfg_attr( feature = "panic_immediate_abort" , inline) ]
168- #[ track_caller]
169- #[ rustc_const_stable_indirect] // must follow stable const rules since it is exposed to stable
170- #[ lang = stringify!( $lang) ]
171- pub const fn $lang( ) -> ! {
172- // Use Arguments::new_const instead of format_args!("{expr}") to potentially
173- // reduce size overhead. The format_args! macro uses str's Display trait to
174- // write expr, which calls Formatter::pad, which must accommodate string
175- // truncation and padding (even though none is used here). Using
176- // Arguments::new_const may allow the compiler to omit Formatter::pad from the
177- // output binary, saving up to a few kilobytes.
178- panic_fmt( fmt:: Arguments :: new_const( & [ $message] ) ) ;
179- }
180- ) +
181- }
158+ $(
159+ /// This is a panic called with a message that's a result of a MIR-produced Assert.
160+ //
161+ // never inline unless panic_immediate_abort to avoid code
162+ // bloat at the call sites as much as possible
163+ #[ cfg_attr( not( feature = "panic_immediate_abort" ) , inline( never) , cold) ]
164+ #[ cfg_attr( feature = "panic_immediate_abort" , inline) ]
165+ #[ track_caller]
166+ #[ rustc_const_stable_indirect] // must follow stable const rules since it is exposed to stable
167+ #[ lang = stringify!( $lang) ]
168+ pub const fn $lang( ) -> ! {
169+ // Use Arguments::new_const instead of format_args!("{expr}") to potentially
170+ // reduce size overhead. The format_args! macro uses str's Display trait to
171+ // write expr, which calls Formatter::pad, which must accommodate string
172+ // truncation and padding (even though none is used here). Using
173+ // Arguments::new_const may allow the compiler to omit Formatter::pad from the
174+ // output binary, saving up to a few kilobytes.
175+ panic_fmt( fmt:: Arguments :: new_const( & [ $message] ) ) ;
176+ }
177+ ) +
182178 }
183179}
184180
185181// Unfortunately this set of strings is replicated here and in a few places in the compiler in
186182// slightly different forms. It's not clear if there's a good way to deduplicate without adding
187183// special cases to the compiler (e.g., a const generic function wouldn't have a single definition
188184// shared across crates, which is exactly what we want here).
189- panic_const ! {
190- panic_const_add_overflow = "attempt to add with overflow" ,
191- panic_const_sub_overflow = "attempt to subtract with overflow" ,
192- panic_const_mul_overflow = "attempt to multiply with overflow" ,
193- panic_const_div_overflow = "attempt to divide with overflow" ,
194- panic_const_rem_overflow = "attempt to calculate the remainder with overflow" ,
195- panic_const_neg_overflow = "attempt to negate with overflow" ,
196- panic_const_shr_overflow = "attempt to shift right with overflow" ,
197- panic_const_shl_overflow = "attempt to shift left with overflow" ,
198- panic_const_div_by_zero = "attempt to divide by zero" ,
199- panic_const_rem_by_zero = "attempt to calculate the remainder with a divisor of zero" ,
200- panic_const_coroutine_resumed = "coroutine resumed after completion" ,
201- panic_const_async_fn_resumed = "`async fn` resumed after completion" ,
202- panic_const_async_gen_fn_resumed = "`async gen fn` resumed after completion" ,
203- panic_const_gen_fn_none = "`gen fn` should just keep returning `None` after completion" ,
204- panic_const_coroutine_resumed_panic = "coroutine resumed after panicking" ,
205- panic_const_async_fn_resumed_panic = "`async fn` resumed after panicking" ,
206- panic_const_async_gen_fn_resumed_panic = "`async gen fn` resumed after panicking" ,
207- panic_const_gen_fn_none_panic = "`gen fn` should just keep returning `None` after panicking" ,
185+ pub mod panic_const {
186+ use super :: * ;
187+ panic_const ! {
188+ panic_const_add_overflow = "attempt to add with overflow" ,
189+ panic_const_sub_overflow = "attempt to subtract with overflow" ,
190+ panic_const_mul_overflow = "attempt to multiply with overflow" ,
191+ panic_const_div_overflow = "attempt to divide with overflow" ,
192+ panic_const_rem_overflow = "attempt to calculate the remainder with overflow" ,
193+ panic_const_neg_overflow = "attempt to negate with overflow" ,
194+ panic_const_shr_overflow = "attempt to shift right with overflow" ,
195+ panic_const_shl_overflow = "attempt to shift left with overflow" ,
196+ panic_const_div_by_zero = "attempt to divide by zero" ,
197+ panic_const_rem_by_zero = "attempt to calculate the remainder with a divisor of zero" ,
198+ panic_const_coroutine_resumed = "coroutine resumed after completion" ,
199+ panic_const_async_fn_resumed = "`async fn` resumed after completion" ,
200+ panic_const_async_gen_fn_resumed = "`async gen fn` resumed after completion" ,
201+ panic_const_gen_fn_none = "`gen fn` should just keep returning `None` after completion" ,
202+ panic_const_coroutine_resumed_panic = "coroutine resumed after panicking" ,
203+ panic_const_async_fn_resumed_panic = "`async fn` resumed after panicking" ,
204+ panic_const_async_gen_fn_resumed_panic = "`async gen fn` resumed after panicking" ,
205+ panic_const_gen_fn_none_panic = "`gen fn` should just keep returning `None` after panicking" ,
206+ }
207+ // Separated panic constants list for async drop feature
208+ // (May be joined when the corresponding lang items will be in the bootstrap)
209+ #[ cfg( not( bootstrap) ) ]
210+ panic_const ! {
211+ panic_const_coroutine_resumed_drop = "coroutine resumed after async drop" ,
212+ panic_const_async_fn_resumed_drop = "`async fn` resumed after async drop" ,
213+ panic_const_async_gen_fn_resumed_drop = "`async gen fn` resumed after async drop" ,
214+ panic_const_gen_fn_none_drop = "`gen fn` resumed after async drop" ,
215+ }
208216}
209217
210218/// Like `panic`, but without unwinding and track_caller to reduce the impact on codesize on the caller.
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