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>