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

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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.
This commit is contained in:
Mara Bos
2021-07-06 12:38:26 +00:00
parent eba3228b2a
commit f827d3e285
8 changed files with 53 additions and 11 deletions
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2
compiler/rustc_mir/src/transform/check_consts/mod.rs
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@@ -77,6 +77,8 @@ pub fn is_lang_panic_fn(tcx: TyCtxt<'tcx>, def_id: DefId) -> bool {
Some(def_id) == tcx.lang_items().panic_fn()
|| Some(def_id) == tcx.lang_items().panic_str()
|| Some(def_id) == tcx.lang_items().begin_panic_fn()
|| Some(def_id) == tcx.lang_items().panic_fmt()
|| Some(def_id) == tcx.lang_items().begin_panic_fmt()
}
pub fn rustc_allow_const_fn_unstable(