goto skips declaration of variable

[monarch_dodra via Digitalmars-d-learn]

On Monday, 18 August 2014 at 13:51:14 UTC, nrgyzer wrote:
> Hi all,
>
> I've the following code snipped:
>
> import std.bigint;
> void main(string[] args)
> {
> 	BigInt i = "12345";
> 	if (args.length > 1)
> 	{
> 		goto Exit;
> 	}
> 	i = BigInt("67890");
> 	Exit:
> 		return;
> }

For what it's worth, whenever you have "goto-end" style code, 
place all your code in a proper block, in such a way that all 
your variable declarations are in that block, and all your gotos 
break out of this block. This way, a goto will *never* cross a 
declaration, so coding is easy. The only variables you place at 
the top or the ones that could need cleanup.

void main(string[] args)
{
	//Declarations that need cleanup:
	void* p;

	//Code
	{
		BigInt i = "12345"; //Local variable
		if (args.length > 1)
		{
			goto Exit; //Breaks out of block
		}
		i = BigInt("67890");
		BigInt j = "54321"; //Local variable
	}

	//End
	Exit:
		CleanUp(p);
		return;
}