repr and/or reflection gets confused about box mutability

[graydon]

In core::repr there representation generated for @mut 10 is "@10" whereas for ~mut 10 it's "~mut 10". Someone's disagreeing about that mutability qualifier.

[catamorphism]

Not critical for 0.6, de-milestoning

[thestinger]

This is still an issue. It occurs because a lone @mut 5 is somehow treated as an opaque_box, but one inside another type like a tuple is treated correctly.

[thestinger]

Closing in favour of #8720. The root cause is the normalization of both mutable/immutable managed boxes to opaque boxes.