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-rw-r--r--400.mu1
1 files changed, 1 insertions, 0 deletions
diff --git a/400.mu b/400.mu
index ab1c6dc0..e6cb48c2 100644
--- a/400.mu
+++ b/400.mu
@@ -57,6 +57,7 @@ sig try-write f: (addr stream byte), s: (addr array byte) -> _/eax: boolean
 sig stream-size f: (addr stream byte) -> _/eax: int
 sig space-remaining-in-stream f: (addr stream byte) -> _/eax: int
 sig write-stream f: (addr stream byte), s: (addr stream byte)
+sig write-stream-immutable f: (addr stream byte), s: (addr stream byte)
 sig read-byte s: (addr stream byte) -> _/eax: byte
 sig append-byte f: (addr stream byte), n: int  # really just a byte, but I want to pass in literal numbers
 #sig to-hex-char in/eax: int -> out/eax: int