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

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pragma experimental SMTChecker;
abstract contract D {
function d() external virtual;
}
contract C {
uint x;
D d;
bool lock;
modifier mutex {
require(!lock);
lock = true;
_;
lock = false;
}
function set(uint _x) mutex public {
x = _x;
}
function f() mutex public {
uint y = x;
d.d();
assert(y == x);
}
}