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evaluates its contents in-place.
Can be named or anonymous,
the named version is intended for inheritance
layouts where any given section can be
surrounded by the <%block> tag in order for
it to become overrideable by inheriting
templates, without the need to specify a
top-level <%def> plus explicit call.
Modified scoping and argument rules as well as a
more strictly enforced usage scheme make it ideal
for this purpose without at all replacing most
other things that defs are still good for.
Lots of new docs. [ticket:164]
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