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Add section on method resolution regarding supertrait shadowing #2147

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Add section on method resolution regarding supertrait shadowing #2147

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3 changes: 3 additions & 0 deletions src/expressions/method-call-expr.md
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Expand Up @@ -66,6 +66,9 @@ Then, for each candidate type `T`, search for a [visible] method with a receiver
r[expr.method.ambiguous-target]
If this results in multiple possible candidates, then it is an error, and the receiver must be [converted][disambiguate call] to an appropriate receiver type to make the method call.

r[expr.method.supertrait-shadowing]
As an exception to the above, if all candidates consist of trait methods and one candidate is a sub-trait of all other candidates then that candidate is selected instead of causing an ambiguity error.

r[expr.method.receiver-constraints]
This process does not take into account the mutability or lifetime of the receiver, or whether a method is `unsafe`. Once a method is looked up, if it can't be called for one (or more) of those reasons, the result is a compiler error.

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