--- !ruby/object:RI::MethodDescription 
aliases: 
- !ruby/object:RI::AliasName 
  name: include?
- !ruby/object:RI::AliasName 
  name: has_key?
block_params: 
comment: 
full_name: TMail::Mail#key?
is_singleton: false
name: key?
params: ( key )
visibility: public
