- Also rename a trivial_const_drop to match style of other functions in the util module. - Also add a test for `const Drop` that doesn't depend on a `~const` bound. - Also comment a bit why we remove the const bound during dropck impl check.
- Also rename a trivial_const_drop to match style of other functions in the util module. - Also add a test for `const Drop` that doesn't depend on a `~const` bound. - Also comment a bit why we remove the const bound during dropck impl check.