Compiler: scoping rules can be violated

[GoogleCodeExporter]

if(something())
{
    integer foo = 42
}
else
{
    foo = 666
}

This nonsense compiles and executes, albeit with undefined behavior. Fix 
scoping rules to be enforced properly.

Original issue reported on code.google.com by don.ap...@gmail.com on 5 Sep 2014 at 5:33