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Matthias Krüger
194d52cc18
Refine error span for trait error into borrowed expression Extends the error span refinement in #106477 to drill into borrowed expressions just like tuples/struct/enum literals. For example, ```rs trait Fancy {} trait Good {} impl <'a, T> Fancy for &'a T where T: Good {} impl <S> Good for Option<S> where S: Iterator {} fn want_fancy<F>(f: F) where F: Fancy {} fn example() { want_fancy(&Some(5)); // (BEFORE) ^^^^^^^^ `{integer}` is not an iterator // (AFTER) ^ `{integer}` is not an iterator } ``` Existing heuristics try to find the right part of the expression to "point at"; current heuristics look at e.g. struct constructors and tuples. This PR adds a new check for borrowed expressions when looking into a borrowed type.