Commits on Jan 6, 2022

1. dsl: add ExprType.HasMethod() …

   HasMethod reports whether a type has a given method.
   Unlike Implements(), it will work for both value and pointer types.
   
   fn argument is a function signature, like `WriteString(string) (int, error)`.
   It can also be in form of a method reference for importable types: `io.StringWriter.WriteString`.
   
   To avoid confusion with Implements() method, here is a hint when to use which:
   
   	- To check if it's possible to call F on x, use HasMethod(F)
   	- To check if x can be passed as I interface, use Implements(I)
   
   Refs #331

   

   quasilyte committed Jan 6, 2022
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