bjoernager/rust
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Auto merge of #86998 - m-ou-se:const-panic-fmt-as-str, r=oli-obk

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Make const panic!("..") work in Rust 2021.

During const eval, this replaces calls to core::panicking::panic_fmt and std::panicking::being_panic_fmt with a call to a new const fn: core::panicking::const_panic_fmt. That function uses fmt::Arguments::as_str() to get the str and calls panic_str with that instead.

panic!() invocations with formatting arguments are still not accepted, as the creation of such a fmt::Arguments cannot be done in constant functions right now.

r? `@RalfJung`
This commit is contained in:
bors 2021-07-29 07:12:07 +00:00
commit 6e0a8bf790
17 changed files with 203 additions and 21 deletions
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7
library/std/src/lib.rs
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@ -247,6 +247,7 @@
#![feature(const_fn_floating_point_arithmetic)]
#![feature(const_fn_fn_ptr_basics)]
#![cfg_attr(bootstrap, feature(const_fn_transmute))]
#![feature(const_format_args)]
#![feature(const_io_structs)]
#![feature(const_ip)]
#![feature(const_ipv4)]
@ -555,9 +556,9 @@ pub use core::{
#[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
#[allow(deprecated)]
pub use core::{
assert, assert_matches, cfg, column, compile_error, concat, concat_idents, env, file,
format_args, format_args_nl, include, include_bytes, include_str, line, llvm_asm, log_syntax,
module_path, option_env, stringify, trace_macros,
assert, assert_matches, cfg, column, compile_error, concat, concat_idents, const_format_args,
env, file, format_args, format_args_nl, include, include_bytes, include_str, line, llvm_asm,
log_syntax, module_path, option_env, stringify, trace_macros,
};
#[stable(feature = "core_primitive", since = "1.43.0")]