1 files changed, 42 insertions, 0 deletions
diff --git a/lib/flow.sail b/lib/flow.sail
new file mode 100644
index 00000000..cb7b1b99
--- /dev/null
+++ b/lib/flow.sail
@@ -0,0 +1,42 @@
+$ifndef _FLOW
+$define _FLOW
+
+val not_bool = "not" : bool -> bool
+val and_bool = "and_bool" : (bool, bool) -> bool
+val or_bool = "or_bool" : (bool, bool) -> bool
+
+val eq_atom = {ocaml: "eq_int", lem: "eq"} : forall 'n 'm. (atom('n), atom('m)) -> bool
+
+val neq_atom = {lem: "neq"} : forall 'n 'm. (atom('n), atom('m)) -> bool
+
+function neq_atom (x, y) = not_bool(eq_atom(x, y))
+
+val lteq_atom = "lteq" : forall 'n 'm. (atom('n), atom('m)) -> bool
+val gteq_atom = "gteq" : forall 'n 'm. (atom('n), atom('m)) -> bool
+val lt_atom = "lt"     : forall 'n 'm. (atom('n), atom('m)) -> bool
+val gt_atom = "gt"     : forall 'n 'm. (atom('n), atom('m)) -> bool
+
+val lt_range_atom = "lt"     : forall 'n 'm 'o. (range('n, 'm), atom('o)) -> bool
+val lteq_range_atom = "lteq" : forall 'n 'm 'o. (range('n, 'm), atom('o)) -> bool
+val gt_range_atom = "gt"     : forall 'n 'm 'o. (range('n, 'm), atom('o)) -> bool
+val gteq_range_atom = "gteq" : forall 'n 'm 'o. (range('n, 'm), atom('o)) -> bool
+val lt_atom_range = "lt"     : forall 'n 'm 'o. (atom('n), range('m, 'o)) -> bool
+val lteq_atom_range = "lteq" : forall 'n 'm 'o. (atom('n), range('m, 'o)) -> bool
+val gt_atom_range = "gt"     : forall 'n 'm 'o. (atom('n), range('m, 'o)) -> bool
+val gteq_atom_range = "gteq" : forall 'n 'm 'o. (atom('n), range('m, 'o)) -> bool
+
+$ifdef TEST
+
+val __flow_test : forall 'n 'm. (atom('n), atom('m)) -> unit
+
+function __flow_test (x, y) = {
+  if lteq_atom(x, y) then {
+    _prove(constraint('n <= 'm))
+  } else {
+    _prove(constraint('n > 'm))
+  }
+}
+
+$endif
+
+$endif