Prefer a two value enum over bool

Author: oli-obk

compiler/rustc_hir/src/hir.rs

@@ -1516,7 +1516,7 @@ pub struct PatField<'hir> {
     pub span: Span,
 }
 
-#[derive(Copy, Clone, PartialEq, Debug, HashStable_Generic)]
+#[derive(Copy, Clone, PartialEq, Debug, HashStable_Generic, Hash, Eq, Encodable, Decodable)]
 pub enum RangeEnd {
     Included,
     Excluded,

compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

@@ -2458,11 +2458,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                         let start = start.map(|expr| self.lower_const_arg(expr, FeedConstTy::No));
                         let end = end.map(|expr| self.lower_const_arg(expr, FeedConstTy::No));
 
-                        let include_end = match include_end {
-                            hir::RangeEnd::Included => true,
-                            hir::RangeEnd::Excluded => false,
-                        };
-
                         let pat = tcx.mk_pat(ty::PatternKind::Range { start, end, include_end });
                         Ty::new_pat(tcx, ty, pat)
                     }

compiler/rustc_lint/src/types.rs

@@ -5,7 +5,7 @@ use rustc_abi::{BackendRepr, ExternAbi, TagEncoding, VariantIdx, Variants, Wrapp
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::DiagMessage;
 use rustc_hir::intravisit::VisitorExt;
-use rustc_hir::{AmbigArg, Expr, ExprKind, HirId, LangItem};
+use rustc_hir::{AmbigArg, Expr, ExprKind, HirId, LangItem, RangeEnd};
 use rustc_middle::bug;
 use rustc_middle::ty::layout::{LayoutOf, SizeSkeleton};
 use rustc_middle::ty::{
@@ -893,12 +893,9 @@ fn ty_is_known_nonnull<'tcx>(
                                         let end =
                                             end.try_to_value()?.try_to_bits(tcx, typing_env)?;
 
-                                        if include_end {
-                                            // This also works for negative numbers, as we just need
-                                            // to ensure we aren't wrapping over zero.
-                                            start > 0 && end >= start
-                                        } else {
-                                            start > 0 && end > start
+                                        match include_end {
+                                            RangeEnd::Included => start > 0 && end >= start,
+                                            RangeEnd::Excluded => start > 0 && end > start,
                                         }
                                     }
                                     _ => false,

compiler/rustc_middle/src/ty/pattern.rs

@@ -1,6 +1,7 @@
 use std::fmt;
 
 use rustc_data_structures::intern::Interned;
+use rustc_hir::RangeEnd;
 use rustc_macros::{HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable};
 
 use crate::ty;
@@ -30,10 +31,7 @@ impl<'tcx> fmt::Debug for PatternKind<'tcx> {
                 if let Some(start) = start {
                     write!(f, "{start}")?;
                 }
-                write!(f, "..")?;
-                if include_end {
-                    write!(f, "=")?;
-                }
+                write!(f, "{include_end}")?;
                 if let Some(end) = end {
                     write!(f, "{end}")?;
                 }
@@ -46,5 +44,5 @@ impl<'tcx> fmt::Debug for PatternKind<'tcx> {
 #[derive(Clone, PartialEq, Eq, Hash)]
 #[derive(HashStable, TyEncodable, TyDecodable, TypeVisitable, TypeFoldable)]
 pub enum PatternKind<'tcx> {
-    Range { start: Option<ty::Const<'tcx>>, end: Option<ty::Const<'tcx>>, include_end: bool },
+    Range { start: Option<ty::Const<'tcx>>, end: Option<ty::Const<'tcx>>, include_end: RangeEnd },
 }

compiler/rustc_middle/src/ty/structural_impls.rs

@@ -289,6 +289,7 @@ TrivialTypeTraversalImpls! {
     rustc_hir::def_id::LocalDefId,
     rustc_hir::HirId,
     rustc_hir::MatchSource,
+    rustc_hir::RangeEnd,
     rustc_span::Ident,
     rustc_span::Span,
     rustc_span::Symbol,

compiler/rustc_smir/src/rustc_internal/internal.rs

@@ -5,6 +5,7 @@
 
 // Prefer importing stable_mir over internal rustc constructs to make this file more readable.
 
+use rustc_hir::RangeEnd;
 use rustc_middle::ty::{self as rustc_ty, Const as InternalConst, Ty as InternalTy, TyCtxt};
 use rustc_span::Symbol;
 use stable_mir::abi::Layout;
@@ -91,7 +92,7 @@ impl RustcInternal for Pattern {
             Pattern::Range { start, end, include_end } => rustc_ty::PatternKind::Range {
                 start: start.as_ref().map(|c| c.internal(tables, tcx)),
                 end: end.as_ref().map(|c| c.internal(tables, tcx)),
-                include_end: *include_end,
+                include_end: if *include_end { RangeEnd::Included } else { RangeEnd::Excluded },
             },
         })
     }

compiler/rustc_smir/src/rustc_smir/convert/ty.rs

@@ -408,7 +408,7 @@ impl<'tcx> Stable<'tcx> for ty::Pattern<'tcx> {
             ty::PatternKind::Range { start, end, include_end } => stable_mir::ty::Pattern::Range {
                 start: start.stable(tables),
                 end: end.stable(tables),
-                include_end,
+                include_end: matches!(include_end, rustc_hir::RangeEnd::Included),
             },
         }
     }

compiler/rustc_symbol_mangling/src/v0.rs

@@ -417,7 +417,10 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
                     let consts = [
                         start.unwrap_or(self.tcx.consts.unit),
                         end.unwrap_or(self.tcx.consts.unit),
-                        ty::Const::from_bool(self.tcx, include_end),
+                        ty::Const::from_bool(
+                            self.tcx,
+                            matches!(include_end, rustc_hir::RangeEnd::Included),
+                        ),
                     ];
                     // HACK: Represent as tuple until we have something better.
                     // HACK: constants are used in arrays, even if the types don't match.

compiler/rustc_ty_utils/src/layout.rs

@@ -217,8 +217,9 @@ fn layout_of_uncached<'tcx>(
                             let mut end = extract_const_value(end, ty, cx)?
                                 .try_to_bits(tcx, cx.typing_env)
                                 .ok_or_else(|| error(cx, LayoutError::Unknown(ty)))?;
-                            if !include_end {
-                                end = end.wrapping_sub(1);
+                            match include_end {
+                                rustc_hir::RangeEnd::Included => {}
+                                rustc_hir::RangeEnd::Excluded => end = end.wrapping_sub(1),
                             }
                             scalar.valid_range_mut().end = end;
                         }