Rollup merge of #58717 - hellow554:nonzero_parse, r=oli-obk

Add FromStr impl for NonZero types

This is a WIP implementation because I do have some questions regarding the solution.

Somebody should ping the lang team on this I guess.
Please see the annotations on the code for more details.

Closes #58604

1 files changed, 2 insertions, 1 deletions

diff --git a/src/librustc_codegen_llvm/debuginfo/metadata.rs b/src/librustc_codegen_llvm/debuginfo/metadata.rs
index 8efa025e3dd..042a8c60cfa 100644
--- a/src/librustc_codegen_llvm/debuginfo/metadata.rs
+++ b/src/librustc_codegen_llvm/debuginfo/metadata.rs
@@ -22,6 +22,7 @@ use rustc::hir::CodegenFnAttrFlags;
 use rustc::hir::def::CtorKind;
 use rustc::hir::def_id::{DefId, CrateNum, LOCAL_CRATE};
 use rustc::ich::NodeIdHashingMode;
+use rustc::mir::interpret::truncate;
 use rustc_data_structures::fingerprint::Fingerprint;
 use rustc::ty::Instance;
 use rustc::ty::{self, AdtKind, ParamEnv, Ty, TyCtxt};
@@ -1368,7 +1369,7 @@ impl EnumMemberDescriptionFactory<'ll, 'tcx> {
                             let value = (i.as_u32() as u128)
                                 .wrapping_sub(niche_variants.start().as_u32() as u128)
                                 .wrapping_add(niche_start);
-                            let value = value & ((1u128 << niche.value.size(cx).bits()) - 1);
+                            let value = truncate(value, niche.value.size(cx));
                             Some(value as u64)
                         };