Bad error recovery when declaring method named "with"

[srawlins]

Parse this code:

class C {
  int with() => 7;
}

Apparently with is a reserved keyword across the board. In analyzer, for example, this produces the following errors:

error • Variables must be declared using the keywords 'const', 'final', 'var' or a type name. • a.dart:2:3 • missing_const_final_var_or_type
error • Expected to find ';'. • a.dart:2:3 • expected_token
error • Expected a class member. • a.dart:2:7 • expected_class_member
error • Expected an identifier. • a.dart:2:11 • missing_identifier

[jensjoha]

Fixed with a840da4, 497bdc5 and 5b76fc2.