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-rw-r--r--compiler/rustc_data_structures/src/memmap.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/compiler/rustc_data_structures/src/memmap.rs b/compiler/rustc_data_structures/src/memmap.rs
index ef37a606f31..ca908671ae5 100644
--- a/compiler/rustc_data_structures/src/memmap.rs
+++ b/compiler/rustc_data_structures/src/memmap.rs
@@ -13,7 +13,8 @@ pub struct Mmap(Vec<u8>);
 impl Mmap {
     #[inline]
     pub unsafe fn map(file: File) -> io::Result<Self> {
-        memmap2::Mmap::map(&file).map(Mmap)
+        // Safety: this is in fact not safe.
+        unsafe { memmap2::Mmap::map(&file).map(Mmap) }
     }
 }