solidity/test/libsolidity/semanticTests/functionCall/calling_uninitialized_function_in_detail.sol

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contract C {
function() returns (uint256) internal x;
int256 mutex;
function t() public returns (uint256) {
if (mutex > 0) {
assembly {
mstore(0, 7)
return(0, 0x20)
}
}
mutex = 1;
// Avoid re-executing this function if we jump somewhere.
x();
return 2;
}
}
// ----
// t() -> FAILURE