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b0935b1ddf
Improve some inference diagnostics - Properly point out point location where "type must be known at this point", or else omit the note if it's not associated with a useful span. - Fix up some type ambiguity diagnostics, errors shouldn't say "cannot infer type for reference `&'a ()`" when the given type has no inference variables.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.