Variable scope not always respected

[GoogleCodeExporter]

What steps will reproduce the problem?

picoc> while(1) {
     >   int e = getchar();
     >   if(e == 0x20) break;
     > }
f
d
t

picoc> int e;
             ^
:5: 'e' is already defined

What is the expected output? What do you see instead?
Variable "e" should have no meaning outside of the while() block, however, it 
is still defined when execution continues past the block.


What version of the product are you using? On what operating system?
This happens both on v2.1 and on r608, both on x86-64 Linux 3.14 with GCC 
4.8.2, and on a platform with SH4 CPU I'm porting PicoC to (with great 
success), and for which I cross-compile using GCC 4.8.2 too.


Please provide any additional information below.
This also appears to happen with if blocks, and probably with for blocks too...

picoc> if(1) {
     >   int a = 6;
     > }
     > int a;
             ^
:4: 'a' is already defined
picoc>

Original issue reported on code.google.com by [email protected] on 30 Jan 2015 at 6:43