solidity/test/libsolidity/syntaxTests/functionTypes/valid_function_type_variables.sol

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contract test {
function fa(uint) {}
function fb(uint) internal {}
function fc(uint) internal {}
function fd(uint) external {}
function fe(uint) external {}
function ff(uint) internal {}
function fg(uint) internal pure {}
function fh(uint) pure internal {}
function(uint) a = fa;
function(uint) internal b = fb; // (explicit internal applies to the function type)
function(uint) internal internal c = fc;
function(uint) external d = this.fd;
function(uint) external internal e = this.fe;
function(uint) internal public f = ff;
function(uint) internal pure public g = fg;
function(uint) pure internal public h = fh;
}
// ----
// TypeError: (545-582): Internal or recursive type is not allowed for public state variables.
// TypeError: (588-630): Internal or recursive type is not allowed for public state variables.
// TypeError: (636-678): Internal or recursive type is not allowed for public state variables.