Consider the following code snippet:

struct Foo { inner: u32, } impl From<u32> for Foo { fn from(inner: u32) -> Self { Self { inner } } } 

This will trigger a 'struct is never constructed' warning, even though the struct is clearly constructed in the implementation of From<u32>.

The problem seems to be caused by using Self as the constructor. If I replace Self with the name of the struct, as in the following code snippet, the warning goes away:

struct Foo { inner: u32, } impl From<u32> for Foo { fn from(inner: u32) -> Self { Foo { inner } } }