Scope differences: C vs C# vs AS3 (using C/C# code, but it applies equally to AS3)

ScopeDifferences.cs

///// Example 1 - C:Valid, C#:Error, AS3:Warning /////

bool isHappy = true;

if(true)
{
  bool isHappy = true; 
}

///// Example 2 - C:Valid, C#:Error, AS3:Warning /////

if(true)
{
  bool isHappy = true; 
}

bool isHappy = true;

///// Example 3 - C:Valid, C#:Valid, AS3:Warning /////

if(true)
{
  bool isHappy = true; 
}

if(true)
{
  bool isHappy = true;
}