For stable const fn, rustdoc does not always show both the version of `fn` stabilization and `const` stabilization

[RalfJung]

Consider for instance this:

It just says "const: 1.32.0". Other functions say "1.27.0 (const: 1.32.0)". That seems like a bug?

[RalfJung]

It was pointed out that rustdoc omits the version of a method when it equals the type. That makes sense when the version is then entirely omitted, but here the "const" version is still shown; I interpreted this as meaning "1.32 is when this got stabilized" and didn't realize it mean only const-stabilization (and "scroll up to the top of this page" for the other version).

[asquared31415]

in my opinion it's always useful to see the stabilization version, even if it's the same as the containing type's stabilization version. the ui element is not obstructive or distracting, doesn't take up much space, and the space it takes is already not particularly valuable space.