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And the same for !=
If we tried to declare these signatures in non-fictional classes,
we would be chastised about collapsing into the "same signature after
erasure".
This will have an influence of typing, as the typechecking of
arguments is sensitive to overloading: if multiple variants are
feasible, the argument will be typechecked with a wildcard expected
type. So people inspecting the types of the arguments to `==` before
this change might have seen an interesting type for
`if (true) x else y`, but now the `If` will have type `Any`, as we
don't need to calculate the LUB.
I've left a TODO to note that we should really make `Any#{==, !=}`
non-final and include a final override in `AnyVal`. But I don't think
that is particularly urgent.
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Adds a new marker /*_*/ to trigger scope completion test.
Original type completion test oracles update for the tweaked output
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Conflicts:
src/interactive/scala/tools/nsc/interactive/Global.scala
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`List(1, 2, 3).map(f).<ctrl-space>` now works; before
the tree had the type `(bf: CanBuildFrom[...]):...` and
did not contribute completions from the result type.
This commit checks if the tree has an implicit method
type, and typechecks it as a qualifier. That is enough
to get to `adaptToImplicitMethod` in the type checker,
infer the implicit arguments, and compute the final result
type accordingly.
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