2

Why does this fail to compile on Solidity?

contract TestContract {
    function testFunc() {
        int256 constant testVar = 1;
    }
}

It compiles if I remove the constant keyword.

2

In Solidity only state variables can be declared as constant.

State variables can be declared as constant. In this case, they have to be assigned from an expression which is a constant at compile time

Ref: http://solidity.readthedocs.io/en/latest/contracts.html#constant-state-variables

So just move the variable in the contract scope instead of function scope and it will work.

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