df8b0dfc27
Give better error when collecting into `&[T]`
The detection of slice reference of `{integral}` in `rustc_on_unimplemented` is hacky, but a proper solution requires changing `FmtPrinter` to add a parameter to print integers as `{integral}` and I didn't want to change it just for `rustc_on_unimplemented`. I can do that if requested, though.
I'm open to better wording; this is the best I could come up with.
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