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suggest adding const_trait_impl if error because of that

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This commit is contained in:
Deadbeef 2022-12-21 15:47:33 +00:00
parent e7fea8c7e6
commit 23718a3cc2
2 changed files with 13 additions and 1 deletions
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4
compiler/rustc_const_eval/src/transform/check_consts/check.rs
View File

@ -730,6 +730,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
substs,
span: *fn_span,
from_hir_call: *from_hir_call,
feature: Some(sym::const_trait_impl),
});
return;
}
@ -802,6 +803,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
substs,
span: *fn_span,
from_hir_call: *from_hir_call,
feature: None,
});
return;
}
@ -844,6 +846,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
substs,
span: *fn_span,
from_hir_call: *from_hir_call,
feature: None,
});
return;
}
@ -903,6 +906,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
substs,
span: *fn_span,
from_hir_call: *from_hir_call,
feature: None,
});
return;
}

10
compiler/rustc_const_eval/src/transform/check_consts/ops.rs
View File

@ -111,6 +111,7 @@ pub struct FnCallNonConst<'tcx> {
pub substs: SubstsRef<'tcx>,
pub span: Span,
pub from_hir_call: bool,
pub feature: Option<Symbol>,
}
impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
@ -119,7 +120,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
ccx: &ConstCx<'_, 'tcx>,
_: Span,
) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
let FnCallNonConst { caller, callee, substs, span, from_hir_call } = *self;
let FnCallNonConst { caller, callee, substs, span, from_hir_call, feature } = *self;
let ConstCx { tcx, param_env, .. } = *ccx;
let diag_trait = |err, self_ty: Ty<'_>, trait_id| {
@ -318,6 +319,13 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
ccx.const_kind(),
));
if let Some(feature) = feature && ccx.tcx.sess.is_nightly_build() {
err.help(&format!(
"add `#![feature({})]` to the crate attributes to enable",
feature,
));
}
if let ConstContext::Static(_) = ccx.const_kind() {
err.note("consider wrapping this expression in `Lazy::new(|| ...)` from the `once_cell` crate: https://crates.io/crates/once_cell");
}