[SMTChecker] Clear state knowledge after external function calls

1 files changed, 21 insertions, 0 deletions

diff --git a/test/libsolidity/smtCheckerTests/functions/functions_external_1.sol b/test/libsolidity/smtCheckerTests/functions/functions_external_1.sol
new file mode 100644
index 00000000..16482e7a
--- /dev/null
+++ b/test/libsolidity/smtCheckerTests/functions/functions_external_1.sol
@@ -0,0 +1,21 @@
+pragma experimental SMTChecker;
+
+contract D
+{
+	function g(uint x) public;
+}
+
+contract C
+{
+	uint x;
+	function f(uint y, D d) public {
+		require(x == y);
+		assert(x == y);
+		d.g(y);
+		// Storage knowledge is cleared after an external call.
+		assert(x == y);
+	}
+}
+// ----
+// Warning: (119-122): Assertion checker does not yet support the type of this variable.
+// Warning: (240-254): Assertion violation happens here