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Don't suggest impl Trait in path position

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许杰友 Jieyou Xu (Joe) 2023-07-04 11:47:06 +08:00
parent 1a449dcfd2
commit b5208b3611
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3 changed files with 36 additions and 2 deletions
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12
compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs
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@ -162,10 +162,18 @@ fn fmt_printer<'a, 'tcx>(infcx: &'a InferCtxt<'tcx>, ns: Namespace) -> FmtPrinte
let mut infcx_inner = infcx.inner.borrow_mut();
let ty_vars = infcx_inner.type_variables();
let var_origin = ty_vars.var_origin(ty_vid);
if let TypeVariableOriginKind::TypeParameterDefinition(name, _) = var_origin.kind
if let TypeVariableOriginKind::TypeParameterDefinition(name, def_id) = var_origin.kind
&& !var_origin.span.from_expansion()
{
Some(name)
let generics = infcx.tcx.generics_of(infcx.tcx.parent(def_id));
let idx = generics.param_def_id_to_index(infcx.tcx, def_id).unwrap();
let generic_param_def = generics.param_at(idx as usize, infcx.tcx);
if let ty::GenericParamDefKind::Type { synthetic: true, .. } = generic_param_def.kind
{
None
} else {
Some(name)
}
} else {
None
}