param1 = value1
param2 = value2

<block1>
 param2 = value3
 param4 = $param1  # expect: "value1"
 param5 = $param2  # expect: "value3"
</block1>

<block2>
 param6 = $param1  # expect: "value1"
 param7 = $param2  # expect: "value2"
</block2>