Default derivatative triggers clippy pedantic lint

[spease]

EG:
error: Calling std::option::Option<V>::default() is more clear than this expression

See https://rust-lang.github.io/rust-clippy/master/#default_trait_access

This seems to be caused by the usage of default_trait_path to call default() in the generated code rather than using the type name directly.

Sorry no code sample (this is for work code) but it looks pretty straightforward from the code on github.