Thank you Mathieu and Phillipe for you pointers and example.

Just out of curiosity (and as input for writing accurate yes/no test cases  
:) let me ask what is expected by the community (apologies if this sounds  
like a silly question ;-) when is a closure a real one:

1] after #fixTemps (or equivalent)

2] after #blockCopy: (is this equivalent to 1?)

3] after #createBlock: (is this equivalent to 1? to 2?)

4] <put: your requirements: or thoughts: here>

Thank you for your time!

/Klaus