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-rw-r--r--compiler/rustc_mir_transform/src/patch.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/rustc_mir_transform/src/patch.rs b/compiler/rustc_mir_transform/src/patch.rs
index 8f212440565..d831ab50b1a 100644
--- a/compiler/rustc_mir_transform/src/patch.rs
+++ b/compiler/rustc_mir_transform/src/patch.rs
@@ -23,6 +23,8 @@ pub(crate) struct MirPatch<'tcx> {
     terminate_block: Option<(BasicBlock, UnwindTerminateReason)>,
     body_span: Span,
     next_local: usize,
+    /// The number of blocks at the start of the transformation. New blocks
+    /// get appended at the end.
     next_block: usize,
 }