outputOf() looks-up by name
some touches
test throwing on lookup failure
test that the graph is optimized (nested seqs are inlined)
check uniqueness of names
update todo
slightly change the error message
execution.ids() returns an answer even if nothing was invoked
simplify stepFromVertex
separate list of vertices from list of Steps
update todo
more descriptive error
move the computation of list of vertices ordered by their key into Compiler
refactor
inspection of named merge functions
test name conflict of merge functions
lookup output by name given to the comp() operator
START
RED: test written (with some spiking)
GREEN (17m53s from START)