Report unreachable statements because of return and throw statements

[itssamuelrowe]

The compiler should analyze the function body to detect statements that are completely unreachable because of return and throw statements that cause a function to exit.

Consider the following example:

function main(...arguments)
    return 0
    print('Hello, world!')

In the above example, the print statement is never executed because main() is terminated before it can reach the print statement.