Fix use of serde #9
Merged
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Following up on ros2-rust/ros2_rust#532 there is a flaw in the way actions are generated: We use the template for messages twice side-by-side, and that template includes a
use serde::{...}declaration. That means a duplicate declaration will be put in, and the Rust compiler does not like this.This PR refactors the templates just slightly so that the message templates don't contain that declaration, and instead it exists in the outer template, exactly once in each spot where it belongs.