duplicate 0.2.3

The attribute macro `duplicate` can duplicate an item with variable substitution.
Documentation 
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use duplicate::duplicate;
pub struct SomeName();
pub struct SomeName(SomeMember);
pub struct SomeName(SomeMember);
pub struct SomeName2(SomeMember2);
mod mod1 {
    use super::*;
    pub struct SomeName(SomeMember);
    pub struct SomeName2(SomeMember2);
}
mod mod2 {
    use super::*;
    pub struct SomeName(SomeMember);
    pub struct SomeName2(SomeMember2);
}