[Pharo-dev] How to use Opal for parsing peace of code?

Hi! I am interested how to use Opal for parsing peace of code. I have supposed to use something like this: | root node1 node2 | root := OpalCompiler new source: 'Color blue yourself'; useFaultyForParsing: true; parse. root doSemanticAnalysis. node1 := root bestNodeFor: (2 to: 2). node2 := root bestNodeFor: (7 to: 7). But node1 is a RBMethodNode, and node2 is a RBVariableNode. Does it matter if source for OpalCompiler is peace of code or method source? Thank you, Jura