bjoernager/rust
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Rollup merge of #135150 - lcnr:unconstrained-lts-comment, r=oli-obk

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move footnote to ordinary comment

cc #135057
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Matthias Krüger 2025-01-06 08:09:07 +01:00 • committed by GitHub
commit c5c05c2528
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1 changed files with 15 additions and 15 deletions
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30
compiler/rustc_hir_analysis/src/impl_wf_check.rs
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@ -128,21 +128,7 @@ pub(crate) fn enforce_impl_lifetime_params_are_constrained(
for param in &impl_generics.own_params {
match param.kind {
ty::GenericParamDefKind::Lifetime => {
let param_lt = cgp::Parameter::from(param.to_early_bound_region_data());
if lifetimes_in_associated_types.contains(&param_lt) // (*)
&& !input_parameters.contains(&param_lt)
{
let mut diag = tcx.dcx().create_err(UnconstrainedGenericParameter {
span: tcx.def_span(param.def_id),
param_name: param.name,
param_def_kind: tcx.def_descr(param.def_id),
const_param_note: false,
const_param_note2: false,
});
diag.code(E0207);
res = Err(diag.emit());
}
// (*) This is a horrible concession to reality. I think it'd be
// This is a horrible concession to reality. I think it'd be
// better to just ban unconstrained lifetimes outright, but in
// practice people do non-hygienic macros like:
//
@ -160,6 +146,20 @@ pub(crate) fn enforce_impl_lifetime_params_are_constrained(
// permit those, so long as the lifetimes aren't used in
// associated types. I believe this is sound, because lifetimes
// used elsewhere are not projected back out.
let param_lt = cgp::Parameter::from(param.to_early_bound_region_data());
if lifetimes_in_associated_types.contains(&param_lt)
&& !input_parameters.contains(&param_lt)
{
let mut diag = tcx.dcx().create_err(UnconstrainedGenericParameter {
span: tcx.def_span(param.def_id),
param_name: param.name,
param_def_kind: tcx.def_descr(param.def_id),
const_param_note: false,
const_param_note2: false,
});
diag.code(E0207);
res = Err(diag.emit());
}
}
ty::GenericParamDefKind::Type { .. } | ty::GenericParamDefKind::Const { .. } => {
// Enforced in `enforce_impl_non_lifetime_params_are_constrained`.