solidity/test/libsolidity/syntaxTests/controlFlow/uninitializedAccess/struct.sol

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contract C {
struct S { uint a; }
S s;
function f() internal returns (S storage r)
{
r.a = 0;
r = s;
}
}
// ----
// TypeError: (109-110): This variable is of storage pointer type and can be accessed without prior assignment.