key(login)operator(:) variable(&login)
  key(adapter)operator(:) string(mysql)
  key(host)operator(:) string(localhost)
  key(socket)operator(:) string(/Applications/MAMP/tmp/mysql/mysql.sock)
  key(username)operator(:) string(rails)
  key(password)operator(:) 

comment(# A)
key(development)operator(:) variable(&default)
  key(database)operator(:) string(a_development)
  class_variable(<<)operator(:) global_variable(*login)

key(production)operator(:) variable(&production)
  class_variable(<<)operator(:) global_variable(*default)

key(test)operator(:) variable(&test)
  key(database)operator(:) string(a_test)
  class_variable(<<)operator(:) global_variable(*login)

comment(# B)
key(b_development)operator(:) variable(&b)
  key(database)operator(:) string(b_development)
  class_variable(<<)operator(:) global_variable(*login)

key(b_production)operator(:) global_variable(*b)

key(b_test)operator(:)
  key(database)operator(:) string(b_test)
  class_variable(<<)operator(:) global_variable(*login)

comment(# C)
key(c_development)operator(:) variable(&c)
  key(database)operator(:) string(c_development)
  class_variable(<<)operator(:) global_variable(*login)

key(c_production)operator(:) global_variable(*c)

key(c_test)operator(:)
  key(database)operator(:) string(c_test)
  class_variable(<<)operator(:) global_variable(*login)

comment(# D)
key(d_development)operator(:) variable(&d)
  key(database)operator(:) string(d_development)
  class_variable(<<)operator(:) global_variable(*login)

key(d_production)operator(:) global_variable(*d)

key(d_test)operator(:)
  key(database)operator(:) string(d_test)
  class_variable(<<)operator(:) global_variable(*login)