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use crate::infer::{
error_reporting::nice_region_error::NiceRegionError, RegionResolutionError, SubregionOrigin,
};
use rustc_data_structures::intern::Interned;
use rustc_errors::{DiagnosticBuilder, ErrorGuaranteed};
use rustc_middle::ty::{self, RePlaceholder, Region};
impl<'tcx> NiceRegionError<'_, 'tcx> {
/// Emitted wwhen given a `ConcreteFailure` when relating two placeholders.
pub(super) fn try_report_placeholder_relation(
&self,
) -> Option<DiagnosticBuilder<'tcx, ErrorGuaranteed>> {
match &self.error {
Some(RegionResolutionError::ConcreteFailure(
SubregionOrigin::RelateRegionParamBound(span),
Region(Interned(RePlaceholder(ty::Placeholder { name: sub_name, .. }), _)),
Region(Interned(RePlaceholder(ty::Placeholder { name: sup_name, .. }), _)),
)) => {
let msg = "lifetime bound not satisfied";
let mut err = self.tcx().sess.struct_span_err(*span, msg);
let (sub_span, sub_symbol) = match sub_name {
ty::BrNamed(def_id, symbol) => {
(Some(self.tcx().def_span(def_id)), Some(symbol))
}
ty::BrAnon(_, span) => (*span, None),
ty::BrEnv => (None, None),
};
let (sup_span, sup_symbol) = match sup_name {
ty::BrNamed(def_id, symbol) => {
(Some(self.tcx().def_span(def_id)), Some(symbol))
}
ty::BrAnon(_, span) => (*span, None),
ty::BrEnv => (None, None),
};
match (sub_span, sup_span, sub_symbol, sup_symbol) {
(Some(sub_span), Some(sup_span), Some(sub_symbol), Some(sup_symbol)) => {
err.span_note(
sub_span,
format!("the lifetime `{sub_symbol}` defined here..."),
);
err.span_note(
sup_span,
format!("...must outlive the lifetime `{sup_symbol}` defined here"),
);
}
(Some(sub_span), Some(sup_span), _, Some(sup_symbol)) => {
err.span_note(sub_span, "the lifetime defined here...");
err.span_note(
sup_span,
format!("...must outlive the lifetime `{sup_symbol}` defined here"),
);
}
(Some(sub_span), Some(sup_span), Some(sub_symbol), _) => {
err.span_note(
sub_span,
format!("the lifetime `{sub_symbol}` defined here..."),
);
err.span_note(sup_span, "...must outlive the lifetime defined here");
}
(Some(sub_span), Some(sup_span), _, _) => {
err.span_note(sub_span, "the lifetime defined here...");
err.span_note(sup_span, "...must outlive the lifetime defined here");
}
_ => {}
}
err.note("this is a known limitation that will be removed in the future (see issue #100013 <https://github.com/rust-lang/rust/issues/100013> for more information)");
Some(err)
}
_ => None,
}
}
}
|
