From 3e9d3d917a988973d9c657a257029a9bd850f6dc Mon Sep 17 00:00:00 2001
From: DrMeepster <19316085+DrMeepster@users.noreply.github.com>
Date: Fri, 13 May 2022 21:52:22 -0700
Subject: [PATCH] add From impls for BitSet and GrowableBitSet

---
 compiler/rustc_index/src/bit_set.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/compiler/rustc_index/src/bit_set.rs b/compiler/rustc_index/src/bit_set.rs
index 059755a743b..fb3df9f41ea 100644
--- a/compiler/rustc_index/src/bit_set.rs
+++ b/compiler/rustc_index/src/bit_set.rs
@@ -340,6 +340,12 @@ impl<T: Idx> BitRelations<BitSet<T>> for BitSet<T> {
     }
 }
 
+impl<T: Idx> From<GrowableBitSet<T>> for BitSet<T> {
+    fn from(bit_set: GrowableBitSet<T>) -> Self {
+        bit_set.bit_set
+    }
+}
+
 /// A fixed-size bitset type with a partially dense, partially sparse
 /// representation. The bitset is broken into chunks, and chunks that are all
 /// zeros or all ones are represented and handled very efficiently.
@@ -1469,6 +1475,12 @@ impl<T: Idx> GrowableBitSet<T> {
     }
 }
 
+impl<T: Idx> From<BitSet<T>> for GrowableBitSet<T> {
+    fn from(bit_set: BitSet<T>) -> Self {
+        Self { bit_set }
+    }
+}
+
 /// A fixed-size 2D bit matrix type with a dense representation.
 ///
 /// `R` and `C` are index types used to identify rows and columns respectively;