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Rollup merge of #137617 - BoxyUwU:generic_const_parameter_types, r=lcnr

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Introduce `feature(generic_const_parameter_types)`

Allows to define const generic parameters whose type depends on other generic parameters, e.g. `Foo<const N: usize, const ARR: [u8; N]>;`

Wasn't going to implement for this for a while until we could implement it with `bad_inference.rs` resolved but apparently the project simd folks would like to be able to use this for some intrinsics and the inference issue isn't really a huge problem there aiui. (cc ``@workingjubilee`` )
This commit is contained in:
Matthias Krüger
2025-03-01 11:33:58 +01:00
committed by GitHub
parent 11ddd56b31 df5b279ca9
commit 415b207b7f
56 changed files with 419 additions and 154 deletions
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4
compiler/rustc_hir_analysis/src/check/wfcheck.rs
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@@ -966,7 +966,7 @@ fn check_param_wf(tcx: TyCtxt<'_>, param: &hir::GenericParam<'_>) -> Result<(),
let ty = tcx.type_of(param.def_id).instantiate_identity();
if tcx.features().unsized_const_params() {
enter_wf_checking_ctxt(tcx, hir_ty.span, param.def_id, |wfcx| {
enter_wf_checking_ctxt(tcx, hir_ty.span, tcx.local_parent(param.def_id), |wfcx| {
wfcx.register_bound(
ObligationCause::new(
hir_ty.span,
@@ -980,7 +980,7 @@ fn check_param_wf(tcx: TyCtxt<'_>, param: &hir::GenericParam<'_>) -> Result<(),
Ok(())
})
} else if tcx.features().adt_const_params() {
enter_wf_checking_ctxt(tcx, hir_ty.span, param.def_id, |wfcx| {
enter_wf_checking_ctxt(tcx, hir_ty.span, tcx.local_parent(param.def_id), |wfcx| {
wfcx.register_bound(
ObligationCause::new(
hir_ty.span,