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add a useful debug to give_region_a_name

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This commit is contained in:
Niko Matsakis 2018-09-06 12:38:15 -04:00 • committed by Wesley Wiser
parent 4e706f56bd
commit 2eb76fc8a1
1 changed files with 11 additions and 5 deletions
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16
src/librustc_mir/borrow_check/nll/region_infer/error_reporting/region_name.rs
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@ -62,20 +62,26 @@ impl<'tcx> RegionInferenceContext<'tcx> {
assert!(self.universal_regions.is_universal_region(fr));
self.give_name_from_error_region(infcx.tcx, mir_def_id, fr, counter, diag)
let value = self.give_name_from_error_region(infcx.tcx, mir_def_id, fr, counter, diag)
.or_else(|| {
self.give_name_if_anonymous_region_appears_in_arguments(
infcx, mir, mir_def_id, fr, counter, diag)
infcx, mir, mir_def_id, fr, counter, diag,
)
})
.or_else(|| {
self.give_name_if_anonymous_region_appears_in_upvars(
infcx.tcx, mir, fr, counter, diag)
infcx.tcx, mir, fr, counter, diag,
)
})
.or_else(|| {
self.give_name_if_anonymous_region_appears_in_output(
infcx, mir, mir_def_id, fr, counter, diag)
infcx, mir, mir_def_id, fr, counter, diag,
)
})
.unwrap_or_else(|| span_bug!(mir.span, "can't make a name for free region {:?}", fr))
.unwrap_or_else(|| span_bug!(mir.span, "can't make a name for free region {:?}", fr));
debug!("give_region_a_name: gave name {:?}", value);
value
}
/// Check for the case where `fr` maps to something that the