Rollup merge of #126159 - RalfJung:scalarint-size-mismatch, r=oli-obk

ScalarInt: size mismatches are a bug, do not delay the panic

Cc [Zulip](https://rust-lang.zulipchat.com/#narrow/stream/146212-t-compiler.2Fconst-eval/topic/Why.20are.20ScalarInt.20to.20iN.2FuN.20methods.20fallible.3F)

r? ``@oli-obk``

1 files changed, 5 insertions, 4 deletions

diff --git a/compiler/rustc_pattern_analysis/src/rustc.rs b/compiler/rustc_pattern_analysis/src/rustc.rs
index 81c5f355231..8391c694c64 100644
--- a/compiler/rustc_pattern_analysis/src/rustc.rs
+++ b/compiler/rustc_pattern_analysis/src/rustc.rs
@@ -6,11 +6,12 @@ use rustc_hir::def_id::DefId;
 use rustc_hir::HirId;
 use rustc_index::{Idx, IndexVec};
 use rustc_middle::middle::stability::EvalResult;
-use rustc_middle::mir::interpret::Scalar;
 use rustc_middle::mir::{self, Const};
 use rustc_middle::thir::{self, FieldPat, Pat, PatKind, PatRange, PatRangeBoundary};
 use rustc_middle::ty::layout::IntegerExt;
-use rustc_middle::ty::{self, FieldDef, OpaqueTypeKey, Ty, TyCtxt, TypeVisitableExt, VariantDef};
+use rustc_middle::ty::{
+    self, FieldDef, OpaqueTypeKey, ScalarInt, Ty, TyCtxt, TypeVisitableExt, VariantDef,
+};
 use rustc_middle::{bug, span_bug};
 use rustc_session::lint;
 use rustc_span::{ErrorGuaranteed, Span, DUMMY_SP};
@@ -701,9 +702,9 @@ impl<'p, 'tcx: 'p> RustcPatCtxt<'p, 'tcx> {
                     ty::Int(_) => miint.as_finite_int(size.bits()).unwrap(),
                     _ => miint.as_finite_uint().unwrap(),
                 };
-                match Scalar::try_from_uint(bits, size) {
+                match ScalarInt::try_from_uint(bits, size) {
                     Some(scalar) => {
-                        let value = mir::Const::from_scalar(tcx, scalar, ty.inner());
+                        let value = mir::Const::from_scalar(tcx, scalar.into(), ty.inner());
                         PatRangeBoundary::Finite(value)
                     }
                     // The value doesn't fit. Since `x >= 0` and 0 always encodes the minimum value