Move trait impls for primitives near trait definition #14464
Merged
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This is an attempt of fixing #12925.
This PR moves almost all trait implementations for primitive types ((), bool, char, i_, u_, f*) near trait definitions. Only Float trait implementations weren't moved because they heavily rely on constants defined in f32.rs and f64.rs.
Some trait implementations had cfg(not(test)) attribute. I suspect it's because of issue 2912.
Still, someone who knows the problem better should probably check this code.
Closes #12925