Struct constructor not recognized in invocation

[garbervetsky]

Related with #76.

When a constructor is called in an invocation it is recognized as a function invocation rather that a call to a constructor.

` pragma solidity ^0.4.24;

contract StructConstructorInvoke { S[] ss; S s; struct S { uint x; uint y; string z; }

function testStructConstructor() public {
    ss.push(S(22, 33, "abc")); // Here is the problem
    s = ss[0];
    assert (s.x == 22);
    assert (s.y == 33);
}

} `

[shuvendu-lahiri]

@garbervetsky try the fix and close the issue.

[garbervetsky]

@shuvendu-lahiri I tried the fix and it works well.