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Auto merge of #124187 - compiler-errors:self-ctor, r=petrochenkov

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Warn (or error) when `Self` ctor from outer item is referenced in inner nested item

This implements a warning `SELF_CONSTRUCTOR_FROM_OUTER_ITEM` when a self constructor from an outer impl is referenced in an inner nested item. This is a proper fix mentioned https://github.com/rust-lang/rust/pull/117246#discussion_r1374648388.

This warning is additionally bumped to a hard error when the self type references generic parameters, since it's almost always going to ICE, and is basically *never* correct to do.

This also reverts part of https://github.com/rust-lang/rust/pull/117246, since I believe this is the proper fix and we shouldn't need the helper functions (`opt_param_at`/`opt_type_param`) any longer, since they shouldn't really ever be used in cases where we don't have this problem.
This commit is contained in:
bors 2024-05-25 01:17:55 +00:00
commit 21e6de7eb6
13 changed files with 244 additions and 176 deletions
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28
compiler/rustc_middle/src/ty/generics.rs
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@ -245,20 +245,6 @@ impl<'tcx> Generics {
}
}
/// Returns the `GenericParamDef` with the given index if available.
pub fn opt_param_at(
&'tcx self,
param_index: usize,
tcx: TyCtxt<'tcx>,
) -> Option<&'tcx GenericParamDef> {
if let Some(index) = param_index.checked_sub(self.parent_count) {
self.own_params.get(index)
} else {
tcx.generics_of(self.parent.expect("parent_count > 0 but no parent?"))
.opt_param_at(param_index, tcx)
}
}
pub fn params_to(&'tcx self, param_index: usize, tcx: TyCtxt<'tcx>) -> &'tcx [GenericParamDef] {
if let Some(index) = param_index.checked_sub(self.parent_count) {
&self.own_params[..index]
@ -290,20 +276,6 @@ impl<'tcx> Generics {
}
}
/// Returns the `GenericParamDef` associated with this `ParamTy` if it belongs to this
/// `Generics`.
pub fn opt_type_param(
&'tcx self,
param: ParamTy,
tcx: TyCtxt<'tcx>,
) -> Option<&'tcx GenericParamDef> {
let param = self.opt_param_at(param.index as usize, tcx)?;
match param.kind {
GenericParamDefKind::Type { .. } => Some(param),
_ => None,
}
}
/// Returns the `GenericParamDef` associated with this `ParamConst`.
pub fn const_param(&'tcx self, param: ParamConst, tcx: TyCtxt<'tcx>) -> &GenericParamDef {
let param = self.param_at(param.index as usize, tcx);