only issue "variant of the expected type" suggestion for enums
Felix S. Klock II pointed out that this suggestion (introduced in pull-request #43178 / eac74104) was being issued for one-field-struct expected types (in which case it is misleading and outright wrong), even though it was only intended for one-field enum-variants (most notably, `Some`). Particularly tender-hearted code-historians may be inclined to show mercy towards the author of #43178 on the grounds that it's somewhat confusing that struct field definitions are given in a type called `ty::VariantDef`. Add a conditional to adhere to the original intent. (It would be possible to generalize to structs, but not obviously net desirable.) This adds a level of indentation, so the diff here is going to be easier to read in ignore-whitespace mode (`-w`). Resolves #55250.
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