Derive Macro Merge 

#[derive(Merge)]
{
    // Attributes available to this derive:
    #[merge]
}

Derive the Merge trait.

This macro can be used only on struct items.

Generate a Merge implementation for the annotated type. The generated code calls .merge and .merge_ref on each field.

Field attributes

rename

• Syntax: #[merge(rename = "foo")]

Rename a field so it appears under a different name in the error context.

skip

• Syntax: #[merge(skip)]

Completely skip merging this field. This instructs the macro to not emit code for merging the field. Skipped fields retain the value of self.

with

• Syntax: #[merge(with = path::to::custom::merge)]

Use $module::merge and $module::merge_ref to merge this field instead of its own Merge implementation.

This can be used to make external types Merge without having to use newtypes.