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Auto merge of #77302 - RalfJung:rollup-n8gg3v6, r=RalfJung

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Rollup of 7 pull requests

Successful merges:

 - #76454 (UI to unit test for those using Cell/RefCell/UnsafeCell)
 - #76474 (Add option to pass a custom codegen backend from a driver)
 - #76711 (diag: improve closure/generic parameter mismatch)
 - #77170 (Remove `#[rustc_allow_const_fn_ptr]` and add `#![feature(const_fn_fn_ptr_basics)]`)
 - #77194 (Add doc alias for iterator fold)
 - #77288 (fix building libstd for Miri on macOS)
 - #77295 (Update unstable-book: Fix ABNF in inline assembly docs)

Failed merges:

r? `@ghost`
This commit is contained in:
bors
2020-09-28 18:02:45 +00:00
parent d62d3f7fa9 d9c11929a5
commit fc2daaae61
76 changed files with 940 additions and 882 deletions
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28
compiler/rustc_mir/src/transform/check_consts/ops.rs
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@@ -213,11 +213,21 @@ impl NonConstOp for FnPtrCast {
const STOPS_CONST_CHECKING: bool = true;
fn status_in_item(&self, ccx: &ConstCx<'_, '_>) -> Status {
mcf_status_in_item(ccx)
if ccx.const_kind() != hir::ConstContext::ConstFn {
Status::Allowed
} else {
Status::Unstable(sym::const_fn_fn_ptr_basics)
}
}
fn emit_error(&self, ccx: &ConstCx<'_, '_>, span: Span) {
mcf_emit_error(ccx, span, "function pointer casts are not allowed in const fn");
feature_err(
&ccx.tcx.sess.parse_sess,
sym::const_fn_fn_ptr_basics,
span,
&format!("function pointer casts are not allowed in {}s", ccx.const_kind()),
)
.emit()
}
}
@@ -596,17 +606,21 @@ pub mod ty {
const STOPS_CONST_CHECKING: bool = true;
fn status_in_item(&self, ccx: &ConstCx<'_, '_>) -> Status {
// FIXME: This attribute a hack to allow the specialization of the `futures` API. See
// #59739. We should have a proper feature gate for this.
if ccx.tcx.has_attr(ccx.def_id.to_def_id(), sym::rustc_allow_const_fn_ptr) {
if ccx.const_kind() != hir::ConstContext::ConstFn {
Status::Allowed
} else {
mcf_status_in_item(ccx)
Status::Unstable(sym::const_fn_fn_ptr_basics)
}
}
fn emit_error(&self, ccx: &ConstCx<'_, '_>, span: Span) {
mcf_emit_error(ccx, span, "function pointers in const fn are unstable");
feature_err(
&ccx.tcx.sess.parse_sess,
sym::const_fn_fn_ptr_basics,
span,
&format!("function pointers cannot appear in {}s", ccx.const_kind()),
)
.emit()
}
}