pub fn apply<O: Operation>(
model: NamedModel,
step: &str,
args: &O::Args,
) -> GeopResult<Part>Expand description
What O’s step step with args makes of model, as a program of two
steps would build it — the model given, then the step — together with
what else the step made: the part, after its one run. For an
operation’s tests, which build the model they act on directly.