Reduce verbosity of suggestion message and mention lifetime in label
This commit is contained in:
Esteban Küber
parent
4e90f177cc
commit
921f35fe73
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@ -1,6 +1,5 @@
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//! Error Reporting for static impl Traits.
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use crate::infer::error_reporting::msg_span_from_free_region;
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use crate::infer::error_reporting::nice_region_error::NiceRegionError;
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use crate::infer::lexical_region_resolve::RegionResolutionError;
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use rustc_errors::{Applicability, ErrorReported};
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@ -33,9 +32,17 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
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let sp = var_origin.span();
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let return_sp = sub_origin.span();
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let param_info = self.find_param_with_region(sup_r, sub_r)?;
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let (lifetime_name, lifetime) = if sup_r.has_name() {
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(sup_r.to_string(), format!("lifetime `{}`", sup_r))
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} else {
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("'_".to_owned(), "the anonymous lifetime `'_`".to_string())
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};
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let mut err =
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self.tcx().sess.struct_span_err(sp, "cannot infer an appropriate lifetime");
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err.span_label(param_info.param_ty_span, "data with this lifetime...");
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err.span_label(
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param_info.param_ty_span,
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&format!("this data with {}...", lifetime),
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);
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debug!("try_report_static_impl_trait: param_info={:?}", param_info);
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// We try to make the output have fewer overlapping spans if possible.
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@ -60,10 +67,6 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
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);
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}
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let (lifetime, _) = msg_span_from_free_region(self.tcx(), sup_r);
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let lifetime_name =
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if sup_r.has_name() { sup_r.to_string() } else { "'_".to_owned() };
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// only apply this suggestion onto functions with
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// explicit non-desugar'able return.
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if fn_return.span.desugaring_kind().is_none() {
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@ -93,8 +96,11 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
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{
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err.span_suggestion_verbose(
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span,
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"consider changing the `impl Trait`'s explicit \
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`'static` bound",
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&format!(
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"consider changing the `impl Trait`'s explicit \
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`'static` bound to {}",
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lifetime,
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),
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lifetime_name,
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Applicability::MaybeIncorrect,
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);
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@ -118,40 +124,41 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
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);
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};
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}
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TyKind::TraitObject(_, lt) => {
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match lt.name {
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LifetimeName::ImplicitObjectLifetimeDefault => {
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err.span_suggestion_verbose(
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fn_return.span.shrink_to_hi(),
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&format!(
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"to permit non-static references in a trait object \
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value, you can add an explicit bound for {}",
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lifetime,
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),
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format!(" + {}", lifetime_name),
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Applicability::MaybeIncorrect,
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);
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}
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_ => {
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err.span_suggestion_verbose(
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lt.span,
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"consider changing the trait object's explicit \
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`'static` bound",
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lifetime_name,
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Applicability::MaybeIncorrect,
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);
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err.span_suggestion_verbose(
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param_info.param_ty_span,
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&format!(
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"alternatively, set an explicit `'static` lifetime \
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in this parameter",
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),
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param_info.param_ty.to_string(),
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Applicability::MaybeIncorrect,
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);
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}
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TyKind::TraitObject(_, lt) => match lt.name {
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LifetimeName::ImplicitObjectLifetimeDefault => {
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err.span_suggestion_verbose(
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fn_return.span.shrink_to_hi(),
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&format!(
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"to permit non-static references in a trait object \
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value, you can add an explicit bound for {}",
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lifetime,
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),
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format!(" + {}", lifetime_name),
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Applicability::MaybeIncorrect,
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);
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}
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}
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_ => {
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err.span_suggestion_verbose(
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lt.span,
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&format!(
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"consider changing the trait object's explicit \
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`'static` bound to {}",
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lifetime,
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),
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lifetime_name,
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Applicability::MaybeIncorrect,
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);
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err.span_suggestion_verbose(
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param_info.param_ty_span,
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&format!(
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"alternatively, set an explicit `'static` lifetime \
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in this parameter",
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),
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param_info.param_ty.to_string(),
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Applicability::MaybeIncorrect,
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);
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}
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},
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_ => {}
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}
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}
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@ -4,7 +4,7 @@ error: cannot infer an appropriate lifetime
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LL | pub async fn run_dummy_fn(&self) {
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| ^^^^^
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| |
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| data with this lifetime...
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| this data with the anonymous lifetime `'_`...
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| ...is captured here...
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LL | foo(|| self.bar()).await;
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| --- ...and required to be `'static` by this
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@ -5,9 +5,9 @@ LL | fn elided(x: &i32) -> impl Copy { x }
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| ---- --------- ^ ...and is captured here
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| | |
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| | ...is required to be `'static` by this...
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| data with this lifetime...
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| this data with the anonymous lifetime `'_`...
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help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 3:1
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help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_`
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LL | fn elided(x: &i32) -> impl Copy + '_ { x }
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| ^^^^
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@ -19,9 +19,9 @@ LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x }
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| ------- --------- ^ ...and is captured here
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| | |
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| | ...is required to be `'static` by this...
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| data with this lifetime...
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| this data with lifetime `'a`...
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help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 6:13
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help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for lifetime `'a`
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LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x }
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| ^^^^
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@ -33,9 +33,9 @@ LL | fn elided2(x: &i32) -> impl Copy + 'static { x }
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| ---- ------------------- ^ ...and is captured here
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| | |
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| | ...is required to be `'static` by this...
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| data with this lifetime...
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| this data with the anonymous lifetime `'_`...
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help: consider changing the `impl Trait`'s explicit `'static` bound
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help: consider changing the `impl Trait`'s explicit `'static` bound to the anonymous lifetime `'_`
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LL | fn elided2(x: &i32) -> impl Copy + '_ { x }
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| ^^
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@ -51,9 +51,9 @@ LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x }
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| ------- ------------------- ^ ...and is captured here
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| | |
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| | ...is required to be `'static` by this...
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| data with this lifetime...
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| this data with lifetime `'a`...
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help: consider changing the `impl Trait`'s explicit `'static` bound
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help: consider changing the `impl Trait`'s explicit `'static` bound to lifetime `'a`
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LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'a { x }
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| ^^
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@ -77,9 +77,9 @@ LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
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| ------- -------------------------------- ^ ...and is captured here
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| | |
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| | ...is required to be `'static` by this...
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| data with this lifetime...
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| this data with lifetime `'a`...
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help: consider changing the `impl Trait`'s explicit `'static` bound
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help: consider changing the `impl Trait`'s explicit `'static` bound to lifetime `'a`
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LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'a { x }
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| ^^
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@ -113,9 +113,9 @@ LL | fn elided3(x: &i32) -> Box<dyn Debug> { Box::new(x) }
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| | | |
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| | | ...and is captured here
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| | ...is required to be `'static` by this...
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| data with this lifetime...
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| this data with the anonymous lifetime `'_`...
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help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 18:1
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help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_`
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LL | fn elided3(x: &i32) -> Box<dyn Debug + '_> { Box::new(x) }
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| ^^^^
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@ -128,9 +128,9 @@ LL | fn explicit3<'a>(x: &'a i32) -> Box<dyn Debug> { Box::new(x) }
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| | | |
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| | | ...and is captured here
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| | ...is required to be `'static` by this...
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| data with this lifetime...
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| this data with lifetime `'a`...
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help: to permit non-static references in a trait object value, you can add an explicit bound for the lifetime `'a` as defined on the function body at 21:14
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help: to permit non-static references in a trait object value, you can add an explicit bound for lifetime `'a`
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LL | fn explicit3<'a>(x: &'a i32) -> Box<dyn Debug + 'a> { Box::new(x) }
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| ^^^^
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@ -142,9 +142,10 @@ LL | fn elided4(x: &i32) -> Box<dyn Debug + 'static> { Box::new(x) }
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| ---- ---------^-
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| | | |
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| | | ...and is captured here
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| data with this lifetime... ...is required to be `'static` by this...
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| | ...is required to be `'static` by this...
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| this data with the anonymous lifetime `'_`...
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help: consider changing the trait object's explicit `'static` bound
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help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_`
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LL | fn elided4(x: &i32) -> Box<dyn Debug + '_> { Box::new(x) }
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| ^^
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@ -160,9 +161,10 @@ LL | fn explicit4<'a>(x: &'a i32) -> Box<dyn Debug + 'static> { Box::new(x) }
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| ------- ---------^-
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| | | |
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| | | ...and is captured here
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| data with this lifetime... ...is required to be `'static` by this...
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| | ...is required to be `'static` by this...
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| this data with lifetime `'a`...
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|
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help: consider changing the trait object's explicit `'static` bound
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help: consider changing the trait object's explicit `'static` bound to lifetime `'a`
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|
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LL | fn explicit4<'a>(x: &'a i32) -> Box<dyn Debug + 'a> { Box::new(x) }
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| ^^
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@ -4,13 +4,13 @@ error: cannot infer an appropriate lifetime
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LL | fn iter_values_anon(&self) -> impl Iterator<Item=u32> {
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| ----- ----------------------- ...is required to be `'static` by this...
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| |
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| data with this lifetime...
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| this data with the anonymous lifetime `'_`...
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LL | self.x.iter().map(|a| a.0)
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| ------ ^^^^
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| |
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| ...and is captured here
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help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the method body at 6:5
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help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_`
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|
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LL | fn iter_values_anon(&self) -> impl Iterator<Item=u32> + '_ {
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| ^^^^
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@ -21,13 +21,13 @@ error: cannot infer an appropriate lifetime
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LL | fn iter_values<'a>(&'a self) -> impl Iterator<Item=u32> {
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| -------- ----------------------- ...is required to be `'static` by this...
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| |
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| data with this lifetime...
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| this data with lifetime `'a`...
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LL | self.x.iter().map(|a| a.0)
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| ------ ^^^^
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| |
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| ...and is captured here
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|
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help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the lifetime `'a` as defined on the method body at 10:20
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help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for lifetime `'a`
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|
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LL | fn iter_values<'a>(&'a self) -> impl Iterator<Item=u32> + 'a {
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| ^^^^
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@ -2,14 +2,14 @@ error: cannot infer an appropriate lifetime
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--> $DIR/issue-16922.rs:4:14
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LL | fn foo<T: Any>(value: &T) -> Box<dyn Any> {
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| -- data with this lifetime...
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| -- this data with the anonymous lifetime `'_`...
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LL | Box::new(value) as Box<dyn Any>
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| ---------^^^^^-
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| | |
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| | ...and is captured here
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| ...is required to be `'static` by this...
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|
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help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 3:1
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help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_`
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|
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LL | fn foo<T: Any>(value: &T) -> Box<dyn Any + '_> {
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| ^^^^
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|
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@ -2,12 +2,12 @@ error: cannot infer an appropriate lifetime
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--> $DIR/object-lifetime-default-from-box-error.rs:18:5
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|
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LL | fn load(ss: &mut SomeStruct) -> Box<dyn SomeTrait> {
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| --------------- data with this lifetime...
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| --------------- this data with the anonymous lifetime `'_`...
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...
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LL | ss.r
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| ^^^^ ...is captured and required to be `'static` here
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|
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help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #2 defined on the function body at 14:1
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help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_`
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|
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LL | fn load(ss: &mut SomeStruct) -> Box<dyn SomeTrait + '_> {
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| ^^^^
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|
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@ -2,14 +2,14 @@ error: cannot infer an appropriate lifetime
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--> $DIR/region-object-lifetime-in-coercion.rs:8:46
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|
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LL | fn a(v: &[u8]) -> Box<dyn Foo + 'static> {
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| ----- data with this lifetime...
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| ----- this data with the anonymous lifetime `'_`...
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LL | let x: Box<dyn Foo + 'static> = Box::new(v);
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| ---------^-
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| | |
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| | ...and is captured here
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| ...is required to be `'static` by this...
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|
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help: consider changing the trait object's explicit `'static` bound
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help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_`
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|
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LL | fn a(v: &[u8]) -> Box<dyn Foo + '_> {
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| ^^
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@ -22,14 +22,14 @@ error: cannot infer an appropriate lifetime
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--> $DIR/region-object-lifetime-in-coercion.rs:13:14
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|
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LL | fn b(v: &[u8]) -> Box<dyn Foo + 'static> {
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| ----- data with this lifetime...
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| ----- this data with the anonymous lifetime `'_`...
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LL | Box::new(v)
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| ---------^-
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| | |
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| | ...and is captured here
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| ...is required to be `'static` by this...
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|
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help: consider changing the trait object's explicit `'static` bound
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help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_`
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|
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LL | fn b(v: &[u8]) -> Box<dyn Foo + '_> {
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| ^^
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@ -42,7 +42,7 @@ error: cannot infer an appropriate lifetime
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--> $DIR/region-object-lifetime-in-coercion.rs:19:14
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|
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LL | fn c(v: &[u8]) -> Box<dyn Foo> {
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| ----- data with this lifetime...
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| ----- this data with the anonymous lifetime `'_`...
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...
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LL | Box::new(v)
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| ---------^-
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@ -50,7 +50,7 @@ LL | Box::new(v)
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| | ...and is captured here
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| ...is required to be `'static` by this...
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|
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help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 16:1
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help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_`
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|
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LL | fn c(v: &[u8]) -> Box<dyn Foo + '_> {
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| ^^^^
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|
|
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@ -2,14 +2,14 @@ error: cannot infer an appropriate lifetime
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--> $DIR/regions-close-object-into-object-2.rs:10:11
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|
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LL | fn g<'a, T: 'static>(v: Box<dyn A<T> + 'a>) -> Box<dyn X + 'static> {
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| ------------------ data with this lifetime...
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| ------------------ this data with lifetime `'a`...
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LL | box B(&*v) as Box<dyn X>
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| ------^^^---------------
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| | |
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| | ...and is captured here
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| ...is required to be `'static` by this...
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|
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help: consider changing the trait object's explicit `'static` bound
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help: consider changing the trait object's explicit `'static` bound to lifetime `'a`
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|
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LL | fn g<'a, T: 'static>(v: Box<dyn A<T> + 'a>) -> Box<dyn X + 'a> {
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| ^^
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|
|
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@ -2,14 +2,14 @@ error: cannot infer an appropriate lifetime
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--> $DIR/regions-close-object-into-object-4.rs:10:11
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|
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LL | fn i<'a, T, U>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'static> {
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| ---------------- data with this lifetime...
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| ---------------- this data with lifetime `'a`...
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LL | box B(&*v) as Box<dyn X>
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| ------^^^---------------
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| | |
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| | ...and is captured here
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| ...is required to be `'static` by this...
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|
|
||||
help: consider changing the trait object's explicit `'static` bound
|
||||
help: consider changing the trait object's explicit `'static` bound to lifetime `'a`
|
||||
|
|
||||
LL | fn i<'a, T, U>(v: Box<dyn A<U>+'a>) -> Box<dyn X + 'a> {
|
||||
| ^^
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@ error: cannot infer an appropriate lifetime
|
|||
--> $DIR/regions-proc-bound-capture.rs:9:14
|
||||
|
|
||||
LL | fn static_proc(x: &isize) -> Box<dyn FnMut() -> (isize) + 'static> {
|
||||
| ------ data with this lifetime...
|
||||
| ------ this data with the anonymous lifetime `'_`...
|
||||
LL | // This is illegal, because the region bound on `proc` is 'static.
|
||||
LL | Box::new(move || { *x })
|
||||
| ---------^^^^^^^^^^^^^^-
|
||||
|
|
@ -10,7 +10,7 @@ LL | Box::new(move || { *x })
|
|||
| | ...and is captured here
|
||||
| ...is required to be `'static` by this...
|
||||
|
|
||||
help: consider changing the trait object's explicit `'static` bound
|
||||
help: consider changing the trait object's explicit `'static` bound to the anonymous lifetime `'_`
|
||||
|
|
||||
LL | fn static_proc(x: &isize) -> Box<dyn FnMut() -> (isize) + '_> {
|
||||
| ^^
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@ error: cannot infer an appropriate lifetime
|
|||
LL | async fn f(self: Pin<&Self>) -> impl Clone { self }
|
||||
| ^^^^ ---------- ---------- ...and required to be `'static` by this
|
||||
| | |
|
||||
| | data with this lifetime...
|
||||
| | this data with the anonymous lifetime `'_`...
|
||||
| ...is captured here...
|
||||
|
||||
error: aborting due to previous error
|
||||
|
|
|
|||
|
|
@ -5,9 +5,9 @@ LL | fn f(self: Pin<&Self>) -> impl Clone { self }
|
|||
| ---------- ---------- ^^^^ ...and is captured here
|
||||
| | |
|
||||
| | ...is required to be `'static` by this...
|
||||
| data with this lifetime...
|
||||
| this data with the anonymous lifetime `'_`...
|
||||
|
|
||||
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the method body at 6:5
|
||||
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_`
|
||||
|
|
||||
LL | fn f(self: Pin<&Self>) -> impl Clone + '_ { self }
|
||||
| ^^^^
|
||||
|
|
|
|||
|
|
@ -12,14 +12,14 @@ error: cannot infer an appropriate lifetime
|
|||
LL | fn foo<G, T>(g: G, dest: &mut T) -> impl FnOnce()
|
||||
| ------ ------------- ...is required to be `'static` by this...
|
||||
| |
|
||||
| data with this lifetime...
|
||||
| this data with the anonymous lifetime `'_`...
|
||||
...
|
||||
LL | / move || {
|
||||
LL | | *dest = g.get();
|
||||
LL | | }
|
||||
| |_____^ ...and is captured here
|
||||
|
|
||||
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 15:1
|
||||
help: to permit non-static references in an `impl Trait` value, you can add an explicit bound for the anonymous lifetime `'_`
|
||||
|
|
||||
LL | fn foo<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
|
||||
| ^^^^
|
||||
|
|
|
|||
|
|
@ -2,12 +2,12 @@ error: cannot infer an appropriate lifetime
|
|||
--> $DIR/dyn-trait-underscore.rs:8:20
|
||||
|
|
||||
LL | fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T>> {
|
||||
| ---- data with this lifetime...
|
||||
| ---- this data with the anonymous lifetime `'_`...
|
||||
LL | // ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static`
|
||||
LL | Box::new(items.iter())
|
||||
| ---------------^^^^--- ...is captured and required to be `'static` here
|
||||
|
|
||||
help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime #1 defined on the function body at 6:1
|
||||
help: to permit non-static references in a trait object value, you can add an explicit bound for the anonymous lifetime `'_`
|
||||
|
|
||||
LL | fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T> + '_> {
|
||||
| ^^^^
|
||||
|
|
|
|||
Loading…
Reference in New Issue