Move ty::BoundConstness to its own little module (cute)

Author: WaffleLapkin

compiler/rustc_middle/src/ty/bound_constness.rs

@@ -0,0 +1,34 @@
+use rustc_hir as hir;
+use std::fmt;
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable, TyEncodable, TyDecodable)]
+pub enum BoundConstness {
+    /// `T: Trait`
+    NotConst,
+    /// `T: ~const Trait`
+    ///
+    /// Requires resolving to const only when we are in a const context.
+    ConstIfConst,
+}
+
+impl BoundConstness {
+    /// Reduce `self` and `constness` to two possible combined states instead of four.
+    pub fn and(&mut self, constness: hir::Constness) -> hir::Constness {
+        match (constness, self) {
+            (hir::Constness::Const, BoundConstness::ConstIfConst) => hir::Constness::Const,
+            (_, this) => {
+                *this = BoundConstness::NotConst;
+                hir::Constness::NotConst
+            }
+        }
+    }
+}
+
+impl fmt::Display for BoundConstness {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::NotConst => f.write_str("normal"),
+            Self::ConstIfConst => f.write_str("`~const`"),
+        }
+    }
+}

compiler/rustc_middle/src/ty/mod.rs

@@ -148,9 +148,11 @@ mod structural_impls;
 mod sty;
 mod typeck_results;
 
+mod bound_constness;
 mod impl_polarity;
 mod visibility;
 
+pub use bound_constness::BoundConstness;
 pub use impl_polarity::ImplPolarity;
 pub use visibility::Visibility;
 
@@ -247,38 +249,6 @@ pub enum ImplSubject<'tcx> {
     Inherent(Ty<'tcx>),
 }
 
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable, TyEncodable, TyDecodable)]
-pub enum BoundConstness {
-    /// `T: Trait`
-    NotConst,
-    /// `T: ~const Trait`
-    ///
-    /// Requires resolving to const only when we are in a const context.
-    ConstIfConst,
-}
-
-impl BoundConstness {
-    /// Reduce `self` and `constness` to two possible combined states instead of four.
-    pub fn and(&mut self, constness: hir::Constness) -> hir::Constness {
-        match (constness, self) {
-            (hir::Constness::Const, BoundConstness::ConstIfConst) => hir::Constness::Const,
-            (_, this) => {
-                *this = BoundConstness::NotConst;
-                hir::Constness::NotConst
-            }
-        }
-    }
-}
-
-impl fmt::Display for BoundConstness {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::NotConst => f.write_str("normal"),
-            Self::ConstIfConst => f.write_str("`~const`"),
-        }
-    }
-}
-
 #[derive(Clone, Debug, PartialEq, Eq, Copy, Hash, TyEncodable, TyDecodable, HashStable)]
 #[derive(TypeFoldable, TypeVisitable)]
 pub struct ClosureSizeProfileData<'tcx> {