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remove now-unused 'is_min_const_fn'

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Ralf Jung 2021-04-25 12:53:55 +02:00
parent 9082078a26
commit 1ecdaa29f9
1 changed files with 0 additions and 49 deletions
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49
compiler/rustc_mir/src/const_eval/fn_queries.rs
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@ -1,4 +1,3 @@
use rustc_attr as attr;
use rustc_hir as hir;
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_middle::hir::map::blocks::FnLikeNode;
@ -34,54 +33,6 @@ pub fn is_unstable_const_fn(tcx: TyCtxt<'_>, def_id: DefId) -> Option<Symbol> {
}
}
/// Returns `true` if this function must conform to `min_const_fn`
pub fn is_min_const_fn(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
// Bail out if the signature doesn't contain `const`
if !tcx.is_const_fn_raw(def_id) {
return false;
}
if tcx.features().staged_api {
// In order for a libstd function to be considered min_const_fn
// it needs to be stable and have no `rustc_const_unstable` attribute.
match tcx.lookup_const_stability(def_id) {
// `rustc_const_unstable` functions don't need to conform.
Some(&attr::ConstStability { ref level, .. }) if level.is_unstable() => false,
None => {
if let Some(stab) = tcx.lookup_stability(def_id) {
if stab.level.is_stable() {
tcx.sess.delay_span_bug(
tcx.def_span(def_id),
"stable const functions must have either `rustc_const_stable` or \
`rustc_const_unstable` attribute",
);
// While we errored above, because we don't know if we need to conform, we
// err on the "safe" side and require min_const_fn.
true
} else {
// Unstable functions need not conform to min_const_fn.
false
}
} else {
// Internal functions are forced to conform to min_const_fn.
// Annotate the internal function with a const stability attribute if
// you need to use unstable features.
// Note: this is an arbitrary choice that does not affect stability or const
// safety or anything, it just changes whether we need to annotate some
// internal functions with `rustc_const_stable` or with `rustc_const_unstable`
true
}
}
// Everything else needs to conform, because it would be callable from
// other `min_const_fn` functions.
_ => true,
}
} else {
// users enabling the `const_fn` feature gate can do what they want
!tcx.features().const_fn
}
}
pub fn is_parent_const_impl_raw(tcx: TyCtxt<'_>, hir_id: hir::HirId) -> bool {
let parent_id = tcx.hir().get_parent_did(hir_id);
if !parent_id.is_top_level_module() { is_const_impl_raw(tcx, parent_id) } else { false }