diff options
Diffstat (limited to 'compiler/rustc_infer/src/errors/note_and_explain.rs')
| -rw-r--r-- | compiler/rustc_infer/src/errors/note_and_explain.rs | 126 |
1 files changed, 48 insertions, 78 deletions
diff --git a/compiler/rustc_infer/src/errors/note_and_explain.rs b/compiler/rustc_infer/src/errors/note_and_explain.rs index ef543b1fb..7328241df 100644 --- a/compiler/rustc_infer/src/errors/note_and_explain.rs +++ b/compiler/rustc_infer/src/errors/note_and_explain.rs @@ -4,12 +4,10 @@ use rustc_errors::{self, AddToDiagnostic, Diagnostic, IntoDiagnosticArg, Subdiag use rustc_middle::ty::{self, TyCtxt}; use rustc_span::{symbol::kw, Span}; -#[derive(Default)] struct DescriptionCtx<'a> { span: Option<Span>, kind: &'a str, arg: String, - num_arg: u32, } impl<'a> DescriptionCtx<'a> { @@ -18,103 +16,74 @@ impl<'a> DescriptionCtx<'a> { region: ty::Region<'tcx>, alt_span: Option<Span>, ) -> Option<Self> { - let mut me = DescriptionCtx::default(); - me.span = alt_span; - match *region { - ty::ReEarlyBound(_) | ty::ReFree(_) => { - return Self::from_early_bound_and_free_regions(tcx, region); - } - ty::ReStatic => { - me.kind = "restatic"; - } - - ty::RePlaceholder(_) => return None, - - ty::ReError(_) => return None, - - // FIXME(#13998) RePlaceholder should probably print like - // ReFree rather than dumping Debug output on the user. - // - // We shouldn't really be having unification failures with ReVar - // and ReLateBound though. - ty::ReVar(_) | ty::ReLateBound(..) | ty::ReErased => { - me.kind = "revar"; - me.arg = format!("{:?}", region); - } - }; - Some(me) - } - - fn from_early_bound_and_free_regions<'tcx>( - tcx: TyCtxt<'tcx>, - region: ty::Region<'tcx>, - ) -> Option<Self> { - let mut me = DescriptionCtx::default(); - let scope = region.free_region_binding_scope(tcx).expect_local(); - match *region { + let (span, kind, arg) = match *region { ty::ReEarlyBound(ref br) => { - let mut sp = tcx.def_span(scope); - if let Some(param) = + let scope = region.free_region_binding_scope(tcx).expect_local(); + let span = if let Some(param) = tcx.hir().get_generics(scope).and_then(|generics| generics.get_named(br.name)) { - sp = param.span; - } - if br.has_name() { - me.kind = "as_defined"; - me.arg = br.name.to_string(); + param.span } else { - me.kind = "as_defined_anon"; + tcx.def_span(scope) }; - me.span = Some(sp) + if br.has_name() { + (Some(span), "as_defined", br.name.to_string()) + } else { + (Some(span), "as_defined_anon", String::new()) + } } ty::ReFree(ref fr) => { if !fr.bound_region.is_named() && let Some((ty, _)) = find_anon_type(tcx, region, &fr.bound_region) { - me.kind = "defined_here"; - me.span = Some(ty.span); + (Some(ty.span), "defined_here", String::new()) } else { + let scope = region.free_region_binding_scope(tcx).expect_local(); match fr.bound_region { ty::BoundRegionKind::BrNamed(_, name) => { - let mut sp = tcx.def_span(scope); - if let Some(param) = - tcx.hir().get_generics(scope).and_then(|generics| generics.get_named(name)) + let span = if let Some(param) = tcx + .hir() + .get_generics(scope) + .and_then(|generics| generics.get_named(name)) { - sp = param.span; - } - if name == kw::UnderscoreLifetime { - me.kind = "as_defined_anon"; + param.span } else { - me.kind = "as_defined"; - me.arg = name.to_string(); + tcx.def_span(scope) }; - me.span = Some(sp); + if name == kw::UnderscoreLifetime { + (Some(span), "as_defined_anon", String::new()) + } else { + (Some(span), "as_defined", name.to_string()) + } } - ty::BrAnon(idx, span) => { - me.kind = "anon_num_here"; - me.num_arg = idx+1; - me.span = match span { + ty::BrAnon(span) => { + let span = match span { Some(_) => span, None => Some(tcx.def_span(scope)), - } - }, + }; + (span, "defined_here", String::new()) + } _ => { - me.kind = "defined_here_reg"; - me.arg = region.to_string(); - me.span = Some(tcx.def_span(scope)); - }, + (Some(tcx.def_span(scope)), "defined_here_reg", region.to_string()) + } } } } - _ => bug!(), - } - Some(me) - } - fn add_to(self, diag: &mut rustc_errors::Diagnostic) { - diag.set_arg("desc_kind", self.kind); - diag.set_arg("desc_arg", self.arg); - diag.set_arg("desc_num_arg", self.num_arg); + ty::ReStatic => (alt_span, "restatic", String::new()), + + ty::RePlaceholder(_) | ty::ReError(_) => return None, + + // FIXME(#13998) RePlaceholder should probably print like + // ReFree rather than dumping Debug output on the user. + // + // We shouldn't really be having unification failures with ReVar + // and ReLateBound though. + ty::ReVar(_) | ty::ReLateBound(..) | ty::ReErased => { + (alt_span, "revar", format!("{:?}", region)) + } + }; + Some(DescriptionCtx { span, kind, arg }) } } @@ -199,10 +168,11 @@ impl AddToDiagnostic for RegionExplanation<'_> { { diag.set_arg("pref_kind", self.prefix); diag.set_arg("suff_kind", self.suffix); - let desc_span = self.desc.span; - self.desc.add_to(diag); + diag.set_arg("desc_kind", self.desc.kind); + diag.set_arg("desc_arg", self.desc.arg); + let msg = f(diag, fluent::infer_region_explanation.into()); - if let Some(span) = desc_span { + if let Some(span) = self.desc.span { diag.span_note(span, msg); } else { diag.note(msg); |