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-rw-r--r--src/print.sig2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/print.sig b/src/print.sig
index 39daf5d0..07b8c1e2 100644
--- a/src/print.sig
+++ b/src/print.sig
@@ -30,6 +30,8 @@
signature PRINT = sig
structure PD : PP_DESC
where type PPS.token = string
+ and type PPS.device = TextIOPP.device
+ and type PPS.stream = TextIOPP.stream
type 'a printer = 'a -> PD.pp_desc