solidity/test/libsolidity/smtCheckerTests/external_calls/external_safe.sol

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pragma experimental SMTChecker;
abstract contract D {
function d() external virtual;
}
contract C {
uint x;
D d;
function f() public {
if (x < 10)
++x;
}
function g() public {
d.d();
assert(x < 11);
}
}