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(Macros, I think, are not the right choice here either: it's still difficult to chain them efficiently, and they tempt you to reuse a single generic-but-suboptimal implementation of each transform.)
I guess there's a fundamental trade-off here: if you merely *denote* a block of code as a map transform, you might be mistaken, whereas a map function will definitely be a map function.
At any rate, it seems like like there's an opportunity for a new systems language to provide dataflow-style constructs without having to compromise on performance; and perhaps this could be accomplished via tooling moreso than syntax.
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