First, you generate from Blocks to Ruby below. ```ruby $global_variable = 0 @local_variable = 0 ``` Second, you change variable scope global to local, local to global below. ```ruby @global_variable = 0 $local_variable = 0 ``` Finaly, you convert from Ruby to Blocks. Expected behavior: - error occurd (error message is 「"@global_variable", can't change variable scope」), because can not change variable scope. Actual behavior: - don't error occurd, and can't change variable scope, below. ```ruby $global_variable = 0 @local_variable = 0 ```