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Extract parent def handling for infer failure err

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This commit is contained in:
William Bain 2020-12-29 17:34:23 -05:00
parent b9d9776fea
commit 62a39ed526
1 changed files with 20 additions and 35 deletions
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55
compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs
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@ -10,7 +10,7 @@ use rustc_middle::hir::map::Map;
use rustc_middle::infer::unify_key::ConstVariableOriginKind;
use rustc_middle::ty::print::Print;
use rustc_middle::ty::subst::{GenericArg, GenericArgKind};
use rustc_middle::ty::{self, DefIdTree, InferConst, Ty};
use rustc_middle::ty::{self, DefIdTree, InferConst, Ty, TyCtxt};
use rustc_span::source_map::DesugaringKind;
use rustc_span::symbol::kw;
use rustc_span::Span;
@ -286,6 +286,7 @@ pub struct InferenceDiagnosticsData {
pub parent: Option<InferenceDiagnosticsParentData>,
}
/// Data on the parent definition where a generic argument was declared.
pub struct InferenceDiagnosticsParentData {
pub prefix: &'static str,
pub name: String,
@ -320,6 +321,20 @@ impl InferenceDiagnosticsData {
}
}
impl InferenceDiagnosticsParentData {
fn for_def_id(tcx: TyCtxt<'_>, def_id: DefId) -> Option<InferenceDiagnosticsParentData> {
let parent_def_id = tcx.parent(def_id)?;
let parent_name =
tcx.def_key(parent_def_id).disambiguated_data.data.get_opt_name()?.to_string();
Some(InferenceDiagnosticsParentData {
prefix: tcx.def_kind(parent_def_id).descr(parent_def_id),
name: parent_name,
})
}
}
impl UnderspecifiedArgKind {
fn prefix_string(&self) -> Cow<'static, str> {
match self {
@ -347,23 +362,6 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
if let TypeVariableOriginKind::TypeParameterDefinition(name, def_id) =
var_origin.kind
{
let parent_data = def_id
.and_then(|def_id| self.tcx.parent(def_id))
.and_then(|parent_def_id| {
let parent_name = self
.tcx
.def_key(parent_def_id)
.disambiguated_data
.data
.get_opt_name()?
.to_string();
Some(InferenceDiagnosticsParentData {
prefix: self.tcx.def_kind(parent_def_id).descr(parent_def_id),
name: parent_name,
})
});
if name != kw::SelfUpper {
return InferenceDiagnosticsData {
name: name.to_string(),
@ -371,7 +369,9 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
kind: UnderspecifiedArgKind::Type {
prefix: "type parameter".into(),
},
parent: parent_data,
parent: def_id.and_then(|def_id| {
InferenceDiagnosticsParentData::for_def_id(self.tcx, def_id)
}),
};
}
}
@ -397,26 +397,11 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
if let ConstVariableOriginKind::ConstParameterDefinition(name, def_id) =
origin.kind
{
let parent_data = self.tcx.parent(def_id).and_then(|parent_def_id| {
let parent_name = self
.tcx
.def_key(parent_def_id)
.disambiguated_data
.data
.get_opt_name()?
.to_string();
Some(InferenceDiagnosticsParentData {
prefix: self.tcx.def_kind(parent_def_id).descr(parent_def_id),
name: parent_name,
})
});
return InferenceDiagnosticsData {
name: name.to_string(),
span: Some(origin.span),
kind: UnderspecifiedArgKind::Const { is_parameter: true },
parent: parent_data,
parent: InferenceDiagnosticsParentData::for_def_id(self.tcx, def_id),
};
}