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-rw-r--r--kernel/prelude/SATS/safe_casts.sats1
-rw-r--r--kernel/prelude/kernel_prelude.hats1
2 files changed, 2 insertions, 0 deletions
diff --git a/kernel/prelude/SATS/safe_casts.sats b/kernel/prelude/SATS/safe_casts.sats
new file mode 100644
index 0000000..50a68a8
--- /dev/null
+++ b/kernel/prelude/SATS/safe_casts.sats
@@ -0,0 +1 @@
+castfn u2uint64{v : nat | v <= 0xFFFFFFFFFFFFFFFF}(v : uint v) : uint64 v
diff --git a/kernel/prelude/kernel_prelude.hats b/kernel/prelude/kernel_prelude.hats
index 39e7560..514c2c2 100644
--- a/kernel/prelude/kernel_prelude.hats
+++ b/kernel/prelude/kernel_prelude.hats
@@ -4,6 +4,7 @@
#include "share/atspre_staload.hats"
staload "./DATS/print.dats"
+staload "./SATS/safe_casts.sats"
#endif