pub fn build_model<O: ModelOperation>(
ctx: &mut StepContext<'_>,
args: &O::Args,
) -> GeopResult<()>Expand description
Produces the step’s node of the model, a chain: O building args into
the model as the steps before left it, or into an empty one, before the
first step that builds any. What fails is said in the context of the
step and its arguments.