Re: Add internal definitions to derived forms

[lloda]

Guile already allows mixed definitions and expressions in let bodies (since 
2.9.4), which isn't in any of the Scheme reports. It's up to authors to avoid 
or isolate Guile extensions if they want to remain rnrs compatible, and this 
patch doesn't change that.

Being able to put definitions in the body of let but not in the bodies of these 
other forms is an artificial restriction. Some forms still aren't fixed, like 
match. I believe we should eventually fix those as well.

I think the root of the issue is (begin), but the patch goes in the right 
direction.

Regards

  Daniel