Dart doesn't have intersection types

[peter-ahe-google]

I'm getting these hints from the analyzer:

sdk/lib/_internal/compiler/implementation/resolution/members.dart:2028:49: [ARGUMENT_TYPE_NOT_ASSIGNABLE]The argument type '{BadInterfaceType,TypedefType,InterfaceType,BadTypedefType,MalformedType}' cannot be assigned to the parameter type 'GenericType'
sdk/lib/_internal/compiler/implementation/resolution/members.dart:2850:52: [ARGUMENT_TYPE_NOT_ASSIGNABLE]The argument type '{FunctionElement,ErroneousElement}' cannot be assigned to the parameter type 'VariableElement'

I've processed the --machine format output to be understood by Emacs.

These hints are wrong, and the messages a type expression that doesn't exist in the Dart language.

[bwilkerson]

Removed Priority-Unassigned label.
Added Priority-Medium, Duplicate labels.
Marked as being merged into #20906.