Get core working on stable and beta about diesel HOT 3 CLOSED

src/expression/extensions/interval_dsl.rs:112:1: 116:2 error: the impl does not reference any types defined in this crate; only traits defined in the current crate can be implemented for arbitrary types [E0117]
src/expression/extensions/interval_dsl.rs:112 impl From<i32> for i64 {
src/expression/extensions/interval_dsl.rs:113     fn from(small: i32) -> i64 {
src/expression/extensions/interval_dsl.rs:114         small as i64
src/expression/extensions/interval_dsl.rs:115     }
src/expression/extensions/interval_dsl.rs:116 }