Stackoverflow and segmentation failure on recrusive dependence mixins.

[iddekingej]

Version: Current Head.
When I compile following scss code with sassc, there is a infinitive recursive loop in:
Sass::bind(std::string, std::string, Sass::Parameters_, Sass::Arguments_, Sass::Context_, Sass::EnvironmentSass::AST_Node_, Sass::Eval) (bind.cpp:13)
The program fails with a stack overflow and a segmentation failure.
What I expected: A error because there is a recursive dependence of mixins

@mixin xx($p_a)
{
    @include yy();
}

@mixin yy(){
    @include xx(3);
}

.x{
    @include yy();
}

[mgreter]

This issue doesn't seem to be handled 100% correctly by ruby sass either. At least our spec runner does not seem to be able to catch it correctly (//CC @chriseppstein @xzyfer).